Dr. Omosefe E answered:
3 years ago
Good afternoon madam. What goes on in the body is sometimes difficult to explain using the ordinary eyes/mind. Fertilisation is known to occur after ovulation (release of the egg) and sperm which can stay as long as 5 days in the body can fertilise the egg anytime after ovulation.
In this case though you have an idea of the day of ovulation, it may actually have occured earlier or later then predicted. Either way, sperm was there waiting and sperm was deposited during ovulation (supposedly), so any from both partners could be lucky enough to get the egg. But that's for the body to decide and not science.
It's one thing to get pregnant, since that's her wish she should focus first on that. When the baby arrives, a simple fatherhood (paternity) test from both partners will prove whose sperm got the egg.
It's quite interesting though.
For such not to occur again, it's best to make a choice of one partner and plan pregnancy in the future.
All the best.