Doing by your due date, which is based on the development of the baby, ovulation was may 18th. Regular period or not, babies grow at the same rate up until 14 weeks. Your actual period doesn't matter at all. It's baby's development.
But that's a averege 28day cycle and would mean my period was on the 3rd may but it was it was round about 21april, cause my period was very iregular, so that's what makes me wonder?
You conceived may 18th so 100% Guy B's.
GoBrandiRanger will you do the same for me, I was with guy1 20th april, came on what I think was my period 21st april, was with guy2 round about 10th may, due date is 7th feb, but there is a week or so between my period and ultrasound?
I'm sorry, I was doing the math in my head before. I just wrote it all out and you ovulated later than average, but still normal. Ovulation is usually directly in the middle of your cycles. From the start of one, to the start of the next.
Also, if I came off brash or abrasive in any way, I apologize. I do know a lot about conception and was only trying to help.