I took plan b for the first time ever. I have never taken any type of birth control. The day before I took plan b I got a negative ovulation test, but I'm not sure if the test was accurate because I took it in the morning. Anyway I panicked & took the pill without reading up on it first because I thought it only stopped the sperm & egg from meeting. And I thought it was like a regular birth control pill. But, I read that it can possibly stop a fertilized egg from implantation. This really concerns me. Does anyone know for a fact if it stops implantation?