I used a non-prescription vitamin that my midwife recommends--Prenatal Forte by NF Labs. It doesn't need to be prescribed to be effective. So, I am sorry that I can't say anything about the one you have.
What I would like to do is offer a bit of advice from one first time mom to another. Make sure you are getting a chance to ask your obstetrician questions and that they are being answered during your appointments. Write them down as they come to you...it will help you remember them when the time comes.
Having used a midwife, I would never go back to an obstetrician if I could help it. However, I know it isn't for everyone. What I do know is that my midwife had plenty of time for my questions and never made me feel rushed...you should expect the same from your caregiver (and their support staff). I went through a period when I just needed to hear the heartbeat...weekly. She obliged.
Good luck and I hope you find the answers to all of your questions.