Hi, I had unprotected sex on the 15th of June, apparently when I was ovulating took plan b within the 24 hour mark. 2 weeks later when I was supposed Get my period on June 29th I got bleeding, it was spotting brown , and then got heavier and more of a red tone that lasted for that night, the day after and day after lasted up to 3/4 days. And I was fine after that. It's been a month and a bit and I've done 4 pregnancy tests---- all negative! My question is if that was implantation bleeding why am I testing negative??? Idk if it was implantation bleeding or my period...