It could have something to do with your hormons? Do you normally have a regular period if you do or don't eaither way it would have to be something a doctor would have to look at! I just had the tinys bit of pink when I wipped so put a tampon in thinking it was the start of my period and there was a dot of blood when I took it out in a hours time, it has been a week since it happened now!
iam kind of going threw the same thing i had unpertected sex a week after my period and to days later i started to bleed kind of light and watery and a day after that i had unpertected sex again and started to bleed the same for about a week or so than i stoped for a few day and now i started again and its the begaining of the month when i have a period usally on the forth i don't know wats goin on...................................help oh and i did get put on birth control in the begining of the year but only had one shot
you can always wait another week or 2 and test again. i mean i was supposed to get my period on 12/6 and did not test positive until 1/1. So you might be one of the ones that takes a while. I have heard other women on here say that they tested negative up until they were almost 2-3 months along. Maybe one of them will answer you too and give you a little more detail. Good luck