My girlfriend started her period on Tuesday January 7th, and it ended on Sunday, January 12th.
On Wednesday, January 15th, I masturbated (decreasing my sperm count).
On Thursday, January 16th we had sex, and the condom broke. A lot of the semen came out (she was above me) but obviously some stayed in.
We immediately rushed out to the store and she took Plan B within 30 minutes.
How worried should I be?