Hey, i think i have implantation bleeding, I started light bleeding 2 days after unprotected sex, it was my first time too, I had unprotected sex On Wednesday at 11pm, i didn't start bleeding until early Friday, it's now Monday and i still am light bleeding, is that common for it to carry on for about 4 days nearly 5. I have had cramps and back pains, a little nausea, head aches. I have peed a little more than i do regular and been drinking water more than other drinks i would usually drink.