Within the past two weeks, I have had sex for the first three times in my life. The last time was two days ago, and I began experiencing vaginal bleeding this morning. My period is not due for two more weeks. We did not use protection, but I am on the pill, and the man did not finish inside me. I am concerned that this is implantation bleeding, because a pregnancy is not in my plan right now. Could it be something else? Thank you!