Late period, possibly pregnant?

So June 23rd I had protected sex with my bf and bc we're both paranoid I took a Take Action (store brand version of Plan B) and I was fine. About 6 days later I started bleeding and I was confused so I looked at my period tracker and it said that when I had sex it was about 3 days before the week of ovulation. I freaked out and immediately assumed it was implantation bleeding (i still don't know if it was). Fast forward to July 15th (usually when I get my period )I still haven't gotten my period. Now fast forward to present day, August 7th and still no sign of period. I took 3 pregnancy tests and they all came back negative but I'm still worried if anyone has anything that may be reassuring or helpful please share. Thank you for reading.