So my girlfriend is on the birth control pill and she missed a pill on the 9th i think and the 21st of november. She didnt take the pill along with that days pill, instead she just took the pill she missed and continued with her schedule. Well we had unprotected sex on november 17th, 21st and the 24th. I pulled out everytime and was really sure i didnt ejaculate in her or on her. Well she just found a brown spot on her panties on the 26th. She said her period should start on the 2nd or 3rd of december. It this because of the hormonal change? Or is it a sign of implantation? Also she itched her vagina and it inflammed quite a bit for a half hour or so, this probably doesnt pertain to the situation but I thought i should mention it just in case. It never was itchy or inflammed after that tho. Please help us with an answer, we are quite worried..