I am confusion !!

Hi so about 3 weeks ago i had sex with my partner and i had my period maybe 3 days after. Everything was Normal we used protection. I am now ovulating and I’ve noticed blood clots and blood like I’m about to start again, I’ve also been having bad cramps,nausea, and I’m always tired no matter what time i go to sleep at night....Is there a chance i could be pregnant ? Or maybe something else is wrong ?