Is there any possibility my gf could get pregnant? please help!!?

tonight we had and i pulled out to . only to find that the condom was broken. I may have had one shot still inside of her as i may have pulled out late but im not sure(would she feel it if i did inside of her?) She is on birth control but she told me that she doesnt take it at the same time every night. sometimes 9pm 11pm or 12pm. Also she just got off of menstruation 4 days ago. so wouldnt that mean shes not ovulating for another 10 days which means she (statistically) wouldnt get pregnant? please read all the info and give your best reply. please im scared SHITLESS