How do you reassure yourself?

I'm 15 weeks and still scared everyday. I've had a miscarriage and then had to go through fertility treatments and <a href="">IVF</a> cycles to get pregnant. I keep worrying that the baby will just die in there. I had the last ultrasound at 12 weeks and a checkup at 13 where we heard the heartbeat again. The doctor said relax at this point we're in good shape, but I'm having such a hard time trusting that everything is ok in there. I hope when I can feel it moving that might help. How do you reassure yourself in between ultrasounds and checkups?