Help please

So lately I been having this lower stomach pain and Friday it made me feel nauseous. I thought it was probably cuz I wasn’t going to the bathroom a lot but I still feel alittle off like something else is not right I just don’t know exactly what . I had my period from the 14-19th and I had sex like 3 or 4 times after that so idk man 😩 yes I have unprotected sex but he do pull out lol