Someone please help. I am on the birth control pill. After my period was over I started taking my next pack of birth control on December 28, 2013. My boyfriend and I had sex the 29th unprotected. Everything has been just fine until last night I found drops of reddish brown blood in my underwear and it was a very light pink on the toilet paper. Today it continues like a very light period. Extremely light period and I have minimal cramps. My period is not suppose to come until next week. Is this implantation bleeding? Could I be pregnant? The stress is killing me and I have no clue what to do. Someone please help.