Okay, on the 9th of July, the day after i got off my period I had SLIGHT unprotected sex. It went in once and we stopped. Just to be safe, and about 10 hours later i took a Plan B. which was expired because it was my last resort and I couldn't buy new ones. I then started my period AGAIN on the 14th. Which was super heavy. Most likely due to the plan B. lately I have been super moody with cramping and alot of constipation. (which isn't unusual for me) so everything was fine until today, I wiped after peeing and had a light pink discharge. I'm freaking out because I already bled from the plan b, is this implantation bleeding?!?!