Hi Dr. I m very concerned that I may be pregnant or experiencing implantation bleeding. I have been taking birth control regularly for about a month and a half now and have only missed it once or twice in the beginning but always made it up immediately the next morning. I had unprotected sex with my boyfriend a few days after my last period ended around the 29th and haven t gotten it yet but since I have had random brown discharge and spotting. I missed taking it on the night that we had unprotected sex but made it up immediately the next morning and haven t missed one since. I took a pregnancy test about 2 days ago and it came up negative but I m still very worried.