Super nervous/scared....

This is my third pregnancy. I have two happy, healthy boys from my previous pregnancies. They were basically text book, "normal" pregnancies except for spotting a couple times and a scare due to my anterior placenta with my second. But for some reason, I'm terrified that I'm going to lose this baby. Why?! I'm not ignorant to the fact that it does happen, I've had people close to me lose their babies (maybe this has made me see that it's a real possibility and that it could really happen to me). But for some reason every time I go to the bathroom I expect there to be blood or something.... I'm worried that my nausea, which is causing me to eat and drink as little as possible to not feel so crappy, is making things worse. I never felt like this with my last pregnancies! What can I do to make it stooooop?!