Period

Has anyone gone several months without their period , but is 100% sure not pregnant!?!?! Cuz ik I'm not pregnant and I've gone 6 months without my period and it pretty much started since I started having sex and I've had blood work don't so ik I'm not pregnant and I don't have insurance to go check and much money matter a fact so idk what to do cuz I'm scared I can't have kids and I mean .., I really want to be a mom at some point