Plan B

I had sex on July 25th around 5 a.m. and the condom broke, we didn't realize until he finished. I'm not on any birth control and that was the day i ovulated. I took Plan B around 6:30 the same morning. Period is expected within a week. I was bloated for maybe 2 days after I took the pill, and afterwards I've been fine with no off symptoms. What do you think the chances of me being pregnant are?