Hi MC,
My story is much like Jessica's. I didn't have chiropractic during my first pregnancy but did during my second. Not only did I do better during my second but my second child is healthier.
Chiropracitc care is about KEEPING the spinal alignment the way God intended it. If you had a short in an electrical panel you would fix it because it would be dangerous to use without repairing it. You body is the same way. The spinal column is the arm of the control center, the brain. It has to be in perfect alignment for everything to work properly.If a chiropractor cannot explain how the spinal alignment helps with the immune system then you need to look for another one. Talk to your FIL and ask him why he thinks it's a good idea and see what he says. I bet he'll tell you the same thing I did.
Please don't be fearful. Chiropractic care is my first line of defense for the immune system to work right. I was able to dodge tubes for my daughter's ear infections, we've been able to control my diabetic husband's blood sugar without medication, my childhood condition that I thought I would have to live with the rest of my life is gone and we all just feel great. Good health is priceless!
My chiropractor is actually pregnant right now with her second child and her 2 year old has never been sick. I know because my teenage girls babysit her. There's a testimony there!
God bless and congratulations on the little one!
M.