On June 15th I had unprotected sex, used plan b within 24 hours, (I could've been ovulating) had symptoms .. loss of appetite, tiredness etc. 2 weeks later June 29th, when I was expecting my period , brown spotting appeared ... later that day /night turned into red blood kinda (dark) to wear a pad, the next day it was heavy, and the day after that it was medium and then just went off to brown spotting again... took 2 pregnancy tests both negative and took them 2 weeks within each other.. one of the tests was a few days after the "bleeding " is this implantation bleeding or was this my period? I'm so confused can someone PLEASE help