Welll what had happened was

So me and my ex ha unprotected sex during the which I thought was the end of my ovulation. Im almost positive he didn’t pull out maybe I was thinking way too much but 10 days later I was super nauseous and crampy But Then I got my period after my period I took a test came out negative not suprising now 3 weeks later I can’t even eat so nauseous all I could do is sleep I’m spotting light pink stomach in knots it feels like what’s should I do !? Please help . I need opinions and advice