I am 15 weeks with twins and I can't get it out of my head that there is something wrong. That I'm going to lose one or both babies, and I don't know why. We had an ultrasound at 13 weeks and both babies had heartbeats and were wriggling around. I know that after the first trimester the chances of miscarriage and vanishing twin go down significantly. I'm not really sure what I'm expecting posting here, but if anyone could just offer a little bit of reassurance that would be great. Thanks.