Zero sex Ed

Ok so I’ve never had sex Ed but I know that periods change and all that. I’ve had my period for 9 years now and it’s finally gotten regular. The flow was consistent and nothing really abnormal happened. I’ve also never really had bad pms. I’ve had cramps sometimes and I get emotional, but nothing too bad.

Anyway. About two-three weeks ago I had unprotected sex (I know. Not smart. It gets worse.) and I’m not on the pill (I know.. basically asking for it.) he put a condom on before he came but I know precum is a thing (I also know it’s a slight chance for pregnancy).

Well I started my period and my body feels like it’s rejecting everything. I’m having hot flashes, cramps literally everywhere, and constantly nauseous. I thought it was just my one changing until I pulled out my cup and saw a small clump of like.. a clear mucusy thing. I think I’m nuts for even considering this, but I need some more educated opinions. Could I have been pregnant and it didn’t take? Or is a clear mucus like clump normal?