I Was Wondering What The Chances Of Conceiving A Child

I was wondering what the chances of conceiving a child 2 days after ovulation and with precum ? He did not ejaculate wasn't completely hard and it was only inserted for 5 mins or less. I was having ovulation pains on Thursday night Friday morning . I have had 3 ultrasounds one at 5 weeks which would be the day this happens and 2 have said I conceived on the day I ovulated Thursday or before