Ok, I've been on the birth contol shot depo provera for about 4 years now, I haven't had ANY periods or spotting for two years. I was 15 days late for my last shot. I got my shot Mar 16th, but had sex Mar 12th. I did take a pregany test two weeks after the 12th and it was negative. I though I was in the clear...but a couple days ago I got a light pink discharge in my panties, not alot...but definanlty pink. All i hear about this kind of discharge is associated with preganancy, however if it was implantation...it was much later then 14 days after unprotected sex. Also depo provera is infamous for delaying fertiity, month or even years after stopping use.