I have taken four pregnancy tests, and they’ve all said no.

I was officially a week late today, and the morning one said no.

I took one at 5 days late, again another no.

I took one my first day I was late and a no.

I took one before that too and still not.

I didn’t get cum in me either the last tome I had sex we used condoms but my period I late.

I have been a little stressed out and sick so could that be why? I also took a Plan B that I believe seriously messed up my cycle. Causing me to get my period twice 3 days apart and really really heavy. Then two weeks later I was spotting to light bleeding for 6 days, could that have counted as my period? (Just messed up because of the plan b?)