I have been spotting for two days very light pink, day three after sex, bright red, mildly heavy, day four, same. Day 5 dark pinkish spotting. Day 6, nothing. Before AF starts I usually get really really sore breast and terrible cramps followed by very heavy bleeding (Use more than half a pack of pads) this month, no breast soreness, no cramps, no pms at all! Took HPT at the start of it all and got BFN. Back hurt just a bit on day two that was it...follow up question...could implantation bleeding be this heavy?? I know people say it's really light, but now that the bleeding stopped my stomach feels so full at the bottom and this was definitely not my normal period...