I'm trying to get pregnant, my last period was november 11. i had sex everyday of my ovulation window. i started bleeding brown/dark red blood december 07, like a light period. could i possibly be pregnant?

Maybe. Maybe not.: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period or getting a weird period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant.