Hi. I missed one birth control pill a few weeks ago, and had sex a few days later. We used a condom and he ?pulled out? way before he finished. However, my period should?ve been here a few days ago, I believe. I have a tiny bit of brown-ish color on the toilet paper when I use the bathroom, but that?s only lasted about an hour, on and off. Not sure if that?s my period or implantation bleeding. I?m paranoid, despite all of the precautions used? I?ve had a stomachache for over a week now, and my stomach makes rumbling noises. My placebo pills ended on Saturday night, and still no period.