Hi I had my tubes tied in April 2013 after a c section. My periods have been regular every month since, but this month my period was due to start the 24-25 and about a week before on the 16 I had light pink when I went pee one time on the toilet paper and nothing till the next day's it turned really light brown and lasted about 3 days but never enough to think about putting a tampon in! It was only enough to see when i wiped sometimes. Now I'm 1-2 days late on period and no signs, could that have been implantation bleeding? Could I be pregnant?