Period or chemical pregnancy?

Hey everyone, so I got my period (I think) for the first time in 7 months yesterday.. do you think this is normal? My bleeding has gotten heavier and is really clotty and I almost fainted this morning when I got out of bed and I just threw up and I'm suuuuper nauseous. My cramps are ridiculous and my lower back and legs hurt really bad too and tmi but like even my vagina has cramps.. I didn't test this month so idk if it's maybe a chemical pregnancy? Or is it just a terrible period because it's been so long? Sorry that was a lot and for it being so tmi..