Keep having stomachache but can't clear out

I'm at my week 17. After today's lunch, I started to have stomachache. Went to try to clear stomach but a little came out. Kind of soft, close to watery. Then the ache stopped. After a while the ache came back again, went to try to clear stomach but again only a little bit came out. This cycle happened about 4 times and I'm in the toilet as I'm typing this message. Anyone experienced this before? Not sure if it is normal or will impact my womb or not. Advice please! #firsttimemom #advicepls #pleasehelp