Urgent advice please!

I know y'all are doctors but I just wanted to see if anyone has experienced this before. I had sex and shortly after I started experiencing pain in my lower left abdomen, then it migrated to the right side. But now ifs like one large cramp from my abdomen all the way up to my shoulder. And it's pretty severe. Im currently sitting in a hot bath hoping it'll ease up. Im also feeling nauseous from the pain and moving makes it worse. It was effecting my breathing at one point too.