Help please!!

Guys. I still haven’t got my period and I’m like super stressing. I took two pregnancy tests one two days ago (@ 2 weeks since the last time I had sex) and it was negative and then one this morning(1 week after missed period) and still negative. I’m so nervous that they’re wrong because I still haven’t gotten it. Like we were safe (condom and pullout) and the tests say no but why haven’t I gotten it!! Ahhhhhhh AND I haven’t told him because Ik it sounds dumb but I do not want to freak him out. Were young and not ready for kids yet. I don’t want to talk to my mom about it either... gosh idk what to do.