period like cramps and standing

Al

so I've been having period like cramps since 29 weeks. I'm now 34. and recently I'll be having the period like cramping and I'll get up to do somthing and it will hurt so much worse. like I have to stop moving for a few minutes and stay bent over or sit back down til the period like pains go away. and I mostly feel it on my right side. any one else having this problem. it's making it difficult to chase after my 20 month old.