On August 15th early in the morning (12-1 A.M.) My boyfriend and I had sex 2 times. We wore a condom both times. After the 2nd time I gave him a blowjob. Well he got hard again. He then put a condom on and we started again, well I heard a snap, and I pulled away. We then realized it had broke. He did NOT cum in the condom and he keeps telling me he knows his dick and that there wasn't enough for pre cum but that is my main concern. Someone have any helpful advice. I was on cycle day 13 with a 3% chance of being pregnant (according to glow) my cycle is usually 21 days long. Please help me with my serious concern.

Thanks