HI I have been on Oralcon Contraceptives and stopped using them about three months ago, two weeks back I took them and three days later me and my fiance had unprotected sex,about 10 days later I had something that seemed like implantation bleeding, I had some brownish blood and some light red blood which was a very light flow and looked liked it has been mixed with water and a bit of cramping, all this lasted for only a day and it was gone, then I never had my normal periods for January,,What are the chances that I might be pregnant