It may be your body telling you to get checked out, it may also be nerves. You are almost over that half way mark and I can imagine its scary. Not to mention, moms worry about their kids. End of story. If you notice any reason to get checked, do it. Otherwise, try doi g some bo ding eith baby or even yoga or a massage to relax.
I'm almost 18 weeks and I feel that way too. I think part of it is because I have really bad dreams
Hmm..not exactly, but in one of my pregnancies I was absolutely terrified to get out of bed at night. If I had to pee I had to wake my husband up to come with me. It passed after a month or so.