I am also pregnant and in your same position, and I too have done a fair amount of research on this issue on my own. Talk about a rock and a hard spot.
Because this is such a loaded issue, I didn't want to even comment at first, but when I saw someone's hysterical -- and highly innaccurate -- remark that 25% of pregnant women who get the H1N1 flu die, I felt it was important to comment and to try to post as much accurate information as I could.
According to a recent Lancet study, the estimated admission [to the hospital] for pregnant women is 0.32 per 100,000 pregnant women, which is four times higher than the general population. As of June 16th, of the 46 deaths from H1N1, six (13%) were pregnant women. Of the six, three (half) of these pregnant woman had pre-existing conditions (asthma and psoriasis, morbid obesity, and Factor V Leiden Deficiency, respectively), and three seemed completely healthy.
http://download.thelancet.com/flatcontentassets/H1N1-flu/...
Additionally, the rate of hospitalization is about twice as high for H1N1 than for the seasonal flu for pregnant women.
The problem is that flu shots in general are considered by the FDA to be Class C drugs. Basically what this means is that there are no studies on the long term effects of these shots on both the pregnant mothers or the children who were fetuses in-utero at the time their mother received the shot, so we do not truly know that these shots do not harm fetal development.
FYI, even "preservative-free" vaccines -- which is the ONLY kind you should even be considering if you decide to get any flu shot while pregnant -- still have trace amounts of thimerosol in them.
From the FDA Website:
Does the influenza vaccine contain thimerosal?
Yes, the majority of influenza vaccines distributed in the United States currently contain thimerosal as a preservative. However, some contain only trace amounts of thimerosal and are considered by the Food and Drug Administration (FDA) to be preservative-free. Manufacturers of preservative-free flu vaccine use thimerosal early in the manufacturing process. The thimerosal gets diluted as the vaccine goes through the steps in processing. By the end of the manufacturing process there is not enough thimerosal left in the vaccine to act as a preservative and the vaccine is labeled "preservative-free".
http://www.cdc.gov/FLU/ABOUT/QA/thimerosal.htm
It a trace amount of thimerosol given to you in a "preservative-free" vaccine going to harm your baby's development? Again, we don't because there have been no long term studies. However, there are definitely parents and pediatricians out there who point to thimerosol exposure as being linked to rising autism rates. Further, the "Age of Autism" site cites a 2005 study funded by the NIH found that ethyl-mercury used in vaccines crosses into the brain of infant primates, resulting in appreciable levels of mercury being trapped in the brain.
http://www.ageofautism.com/2009/10/autism-at-1-in-58-boys...
But what does all of this mean for pregnant human women? Because we do know that statistically, the flu hits pregnant women harder. What is the threshold for safe levels of thimerosol -- or is there a safe level at all? We simply do not know.
As of 2007, CDC reports a 1:150 rate of autism in children; recent numbers have shown that to be even higher. I think one of the best things to come from H1N1 is that, 3-5 years from now, we should have enough data to know what is the best thing, but for now, we are operating with a lot of unknowns.
On one side, you have the risk of very serious, and sometimes deadly complications from H1N1, and those risks increase for pregnant women -- even though, it should be stressed, many and most people who get it have a MILD form of the flu, including pregnant women.
From Wikipedia:
In July 2009, the CDC noted that most [H1N1] infections were mild, similar to seasonal flu, recovery tended to be fairly quick, and deaths to date had been only a fraction of the number of people who die every year from seasonal flu.[54] The 1918 flu epidemic began with a wave of mild cases in the spring, followed by more deadly waves in the autumn, eventually killing hundreds of thousands in the United States.[55] Researchers from the University of Maryland mixed swine flu and seasonal flu and concluded that the swine flu was unlikely to get more lethal.[56]
http://en.wikipedia.org/wiki/2009_flu_pandemic
On the other side, there is the spectre of autism....
Also, lastly, despite these concerns, the CDC has recommended for the last three years that all pregnant women get the flu shot. Similarly, if a pregnant woman gets H1N1, the recommendation is to start anti-viral medications immediately, despite the fact that these are also Class C Drugs, because risk-wise, this seems less dangerous. See the excerpt below:
Pregnant Women
Pregnant women are known to be at higher risk for complications from infection with seasonal influenza viruses, and severe disease among pregnant women was reported during past pandemics. Hospitalizations and deaths have been reported among pregnant women with 2009 H1N1 influenza virus infection, and one study estimated that the risk for hospitalization for 2009 H1N1 influenza was four times higher for pregnant women than for the general population. While oseltamivir and zanamivir are "Pregnancy Category C" medications, indicating that no clinical studies have been conducted to assess the safety of these medications for pregnant women, the available risk-benefit data indicate pregnant women with suspected or confirmed influenza should receive prompt antiviral therapy. Pregnancy should not be considered a contraindication to oseltamivir or zanamivir use. Because of its systemic activity, oseltamivir is preferred for treatment of pregnant women. The drug of choice for chemoprophylaxis is less clear. Zanamivir may be preferable because of its limited systemic absorption; however, respiratory complications that may be associated with zanamivir because of its inhaled route of administration need to be considered, especially in women at risk for respiratory problems.
Anecdotal reports suggest that postpartum women, similar to pregnant women, might be at increased risk for severe complications and death from 2009 H1N1 influenza. These reports are consistent with the postpartum period being a time of transition to normal immune, cardiac, and respiratory function, a transition that is believed to occur quickly, but would be unlikely to occur immediately at delivery. Based on these reports, women should be considered to be at increased risk of influenza-related complications up to 2 weeks postpartum (including following pregnancy loss). Prompt empiric antiviral treatment is indicated for suspected or confirmed 2009 H1N1 influenza in women who are up to 2 weeks postpartum (including following pregnancy loss).
http://www.cdc.gov/h1n1flu/recommendations.htm
Personally, as of this time, because I do not have any other underlying issues aside from simply being pregnant (ie gestational diabetes, obesity, asthma, etc.) I am not going to get either the H1N1 shot or the seasonal flu shot; however I recognize that decision carries with it certain risks. Also, next time, before I am pregnant, I am going to get the pneumococcal conjugate vaccine, as many people who are hospitalized/die from the flu actually die from secondary infections, most commonly respitory pneumonia. For now, I am going to take a lot of preventative measures (including 30 min of mild/moderate exercise daily, enough rest, healthy food, minimize stress, gargle with Listerine 2x/day, use a sinus rinse at least 1x/day, avoid crowds and sick people, take Sambuca extract daily, wash my hands often, use hand sanitizer, and avoid touching my nose and mouth, etc.). I will also be in close contact with my OBGYN, and, if I show any H1N1 flu symptoms, get treatment immediately. I wish I had a crystal ball and could know the best way to go; for me, the potential of exposing my baby to potential autism triggers emotionally outweights my concerns about H1N1, but only time will tell whether or not that is the correct decision.
Whatever your decision is, I wish you the very best, a healthy and happy pregnancy, and a healthy and happy child.
Good luck to you.