I'm 45 and he is 39. I had my last period march 2nd, we had sex march 10th unprotected he ejaculated one drop outside, we waited for 5 minutes he dried his penis and we continued. We had intercourse for about 30 minutes. The intercourse was on the 8th day of my cycle, and I ovulate on day 14 which is in 2 days of a approxiapproximately at 28 day cycle. We are not looking to conceive. I was also taking antibiotics, I know that this can also delay ovulation due to estrogen levels drop. And taking in consideration my age, average life of sperm cells (which I think is more like 72hs that the 5 day), what are the odds? Please answer asap