Almost two weeks ago a day right after my ovulation day, i got into some foreplay. The most that got into me was precum. Thats it. We didnt go far at all. I took Plan B One-Step within 24 hours and a week later (like the 9th or 10th day after taking it) I started bleeding. It started off dark red with like brown around the edges. And then got heavier with clots and the brown went away. It's accompanied with long painful cramps, the same symptoms as my period. My periods are normally heavy but this time it came earlier than my period. (About 3-4 days early) Could this be implanation bleeding or just the plan b pushing my period early?