need opinion please !!

okay so me and my boyfriend had unprotected sex on the 3th he nutted in me.( i was in my fertile week) i’m supposed to start in 10 days or so but my normal period cramps start like 4 days before i start and there sharp and painful but yesterday i’ve been experiencing mild cramps my backs been sore and i’ve been nauseous and have had headache all day. also i’ve been constipated for like a day now i’m nervous i normally don’t get headaches ever so idk i need someone’s opinion 🥺