Im a regular 28 day cycle. Some times, like 2-3x a year, I get a 1 day early period and the only time that I was delayed was during our final examinations which I got delayed for up to 4 days because I was super stressed that time. This month (August 5, 2018) my period ended on the morning of that day (Sunday, in my country Philippines) and we had sex (technically not a sex since he wasnt able to penetrate me) NOTE: He had a condom on even before he touched me and a lubricant on top of it. But even before he penetrated me, he orgasms BUT it is inside the condom the condom is not even broke since we tested it. Just asking what are the chances of getting pregnant due to what had just happened. WE ALWAYS WEAR CONDOM if ever we had sex but we only had sex in a span of 2+ yrs. I am also aware of the rhythm method.