Prego

Hey guys! So me and my boyfriend have done oral before but on Sunday we were ready to move on he broke the condom putting it on and being impatient( I know it's stupid) just said for like 3 seconds I sat on him for like 3 seconds I didn't even move just sat and then I stood up I gave him head and be came 20 minutes later. I was supposed to get my period today but usually it come like a day early but now that it hasn't hit I am freaking out! I know this is my fault don't be judgmental I already learn my lesson is there a large chance I could be pregnant