Plan B after ovulation day still work?

So on Saturday 8/3 I was with my boyfriend and the condom broke. He said he did not completely finished when he pulled out to check the condom. I do not take any form of birth control. And i believe It happened about 2 days after i finished Ovulating. I took plan B about an hour after. Then i started reading some more about plan b and it said that i does not work well with heavier women. So i decided i would take another dose of plan B, in the hopes it would improve my chances of not getting pregnant. It has been a couple days now and there is some light spotting. Now im not sure what to think. What are the odds that i am pregnant? Any information is appreciated.