21 weeks and Diarrhea

Sorry for the TMI but I’m just a little bit worried.

I’ve been constipated pretty much my whole pregnancy except 1-2 instances maybe in the beginning of diarrhea. Last night I had 2 bouts of soft stool with stomach cramping. Then felt fine afterwards. Then this morning I had 3-4 bouts of diarrhea with horrible stomach cramping to the point of where I was crying. I fell asleep after eating some toast and water. Felt like normal cramps you get with diarrhea not like contractions or anything. But I’ve read diarrhea can be a sign of pre-term labor. And considering I barely have a BM these days I’m surprised by the diarrhea. I woke up feeling really dehydrated but stomach was better. Still feels like sour stomach and it’s achy here and there. Baby is moving but it’s never at consistent times it’s pretty sporadic still so easy to worry. FTM just wondering if I need to call my doctor or just relax and see if it all goes away by tomorrow. Any advice is appreciated 🙏🏼

ALSO random sharp pain in my lower right side that Ive been off and on for months. Is acting up today. Ligament pain?