Pregnancy Info HOME

One day after my period (17 days ago) during sex my husband's condom slipped off. We thought we were ok because the condom still contained his fluids altho some had spilled out onto the sheets. However, I've had a "feeling" of "pregnant" and 8 days after that incident I went to the bathroom and discovered blood in my undies. I had some very light pink bleeding that day only. I've had some menstrual -like cramps and lower back pain but no bleeding ever since. My periods are usually right on the mark and I'm not due to start for another week. I never have any problems in between periods and only occassionally have minor cramping with them. I have 3 children and I had this same "feeling" all 3 times before. I took a home pregnancy test this morning and it was negative. I work in a hospital and a friend from the lab ran a beta HCG the day after the bleeding and it came back Neg also. Am I just trying to test to early? Could this have been implantation bleeding? Or, am I making too big a deal of this?