am i pregnant?

Amber

so I had sex where the condom broke but we didn't find out until it was over. it was two days before the end of my period. I messed up on my BC pills so let's assume they were ineffective. I took 4 pills after it. 

it was 13 days ago and I woke up today to horrible cramps and a bunch of dark clumpy blood everywhere. its been a few hours and the blood is redder now but what is the chance I'm pregnant???