Weird pain?

Kassaundra
This is my 3rd baby and I don't recall this with my other 2 so I need a little mommy help. I am 27 weeks and today I have had 2 occasions where I was laying down in bed and if I switched or move to another side my stomach tensed up and it was so painful I could cry. I couldn't even move, but then after a couple of seconds it went away. I have felt her move all day so I'm not sure if it's my uterus or what is going on? Then tonight laying in bed, I sneezed and my stomach tensed up again and my whole belly was in severe pain for about 30 seconds snd then went away. I don't want to call my dr about it because they never see me they just send me to labor and delivery and we technically can't afford to keep going there for every little thing they send me for. So any ideas what it could be or if any other moms are experiencing something similar? TIA