I am freaking out

I am kinda a paranoid person but my period is late and I didn’t realize that the week we had sex was my ovulation week because I am clueless about stuff like that. I am having random pains, headaches, I am tired a lot, and my moods keep changing, this could just be me or it could mean my period in coming but I am young and just very paranoid, I am not sure what to do so I am just waiting to see if my period starts but I was wondering if anyone had any advice.