... I had unprotected sex and he pulled out but i was concerned about the whole pre cum pregnancy thing so I got plan B through my school and took it. The only problem is that I took it two days later. It was within the 72 hour time frame but I'm afraid that it didnt work. About 10-11 days later I got some spotting and bleeding but only for a day. It turned into light and dark brown discharge after and I'm afraid that it was implantation bleeding. I've now had this brown discharge/spotting for 9 days now on and off and I have some breast tenderness and they are more full. I get some cramps too. Is this the Plan B working or early signs of pregnancy? Does anyone know?