Nausea? Am I pregnant?

Been on the pill 8 months, and still get nauseated the all of the time. Some days better than others, but I’m tired of feeling sick all the time. Anyone else been like that? I have unprotected sex, but he pulls out. Had a slip up June 8th. He came in me a little bit, 5 minutes later my period comes on, lasts about 4 days like normal. Do y’all think I’m pregnant? Or should I switch pills? Please let me know if this has happened to you. I always feel like I’m pregnant 🤦🏽‍♀️