Plan B post ovulation

Adebola

My boyfriend and I had unprotected sex the day after I ovulated which was July 10th. He didn't pull out, so I took the plan B pill, but I'm scared it won't work because I was past the ovulation stage. I took a pregnancy test today, because I'm getting my period tomorrow and it said negative. I have been uncomfortably bloated for a week straight now and urinating frequently. Am I being paranoid or could I be pregnant?