sex with condom, then re-entry without condom

i recently had sex with my girlfriend on wed 11/01/06. we had sex while using a condom and everything was fine. after intercourse, i wiped off, then we took a little 10 min nap. when we woke up, we had sex again but this time without a condom, i think i pulled out on time, and when i did i jerked off a bit but very little came out. we didnt have sex for a long duration of time, only about 10 mins. im not so sure if any pre-cum went inside of her that contained any semen. her last period was on 10/21, so we have to wait about 2 weeks to know if she is pregrant. its 11/04 today, and we will have to wait until monday 11/06 to buy emergency contraception. is it not too late? what are the chances that she might get pregnant? please help...thank you