I am 18 years old. My boyfriend & I are sexually active. Last Friday, I got light brown spotting. On Saturday & Sunday, the bleeding was still there it was dark brown though and heavier flow. On Monday & Tuesday, it turned to a regular red period. Wednesday it was over. I was supposed to start my period on Wednesday, but instead I ended this spotting on Wednesday. It's now Friday & I still have no period. I am on BC pill so it always comes at this time. When I was having this spotting, I was having cramps too. I was just wondering if anyone knew if this was implantation bleeding because I am very scared and don't know what to do. Please help me.