Help!!!

So I had sex 2 weeks ago we did it like 3 times. since then my stomach has been hurting and sometimes I feel nauseous and my heads hurt. Now I feel nauseous and my head hurt. I suppose to come on my period today I dont know if I’m on my period or not bc I sometimes don’t bleed due to me being on the pills. do you guys think I’m good? I need some advice I’m very confused 😩