I have went through the pregnancy rollercoaster 7 times,and each time i always worried about one thing or the other,we would'nt be mommies if we did'nt worrie.All in all if you see your doctor regularly and have faith ,the health of your babies will be fine.although worrying is all part of being a mom,for the rest of your life you'll be on a worry roller coaster,so relax its all part of the ride.