I took plan b a day after i had unprotected sex 4-5 days later i notice bleeding. Not regular bleeding but spotting its continued for now a good week and half small spottings but now i got one day of a really heavy flow with clots and it stopped and went back to a normal light flow i got this 2 weeks early. Got period august 9 and again on august 26 is this plan b or implantation bleeding