Plan B?

[sugarkoatedsour.livejournal.com]

So the other night i had sex and the condom ended up falling off. I noticed half way and stopped when i did so he didn't actually finish inside me. However, i don't know how far into the sex it fell off. Now i'm not on any other type of birth control so i'm wondering if i should consider using plan b? I am just in my post menstrual period so i know i am bordering my unsafe days, which is what worries me a little. Should i consider using plan B?

thank you.
x posted to birth control.