missing period continues

okay i know i posted something a few days ago but i can’t seem to ease my mind. my period is a week late as of today.

i took two tests (so far) and both were negative.

the odds of me being pregnant is so low because we’ve only had protected sex 3-4 times since july 4.

however, before july 4 we had unprotected sex for a few seconds before being interrupted, but i took a plan b right after and got my expected period.

this is where i’m confused.. the day my cycle ended last month it was super painful to have sex again. like, started bleeding all over again. that is why we haven’t had sex since.

i don’t feel any symptoms of my period coming, but have never been late like this before. should i still worry that i could be pregnant?

thanks... xx