Nervous about pull out

My boyfriend And I usually always wear condoms because I'm not a birth control. However, this weekend we had ran out of condoms and used pullout 3 times... We did it 3-2 days before my ovulation date and like a couple days after my period ended. My boyfriend always peed before we had sex but I know there's always a chance. How much of a chance is there of me being pregnant? He pulled out on time EVERYTIME but I'm just worried because I'm about to graduate high school and my parents are very Christian and I cannot get pregnant. And I know it was bad we were using pullout we just were getting in the heat of the moment and were not going to have sex without condoms anymore.