Unless you kept track of everytime you had sex there is no way to know for sure. But if you take the birth month and skip forward 3 months you know the month you conceived
My baby is due june 8 and i conceived on sept 15
Idk how you would know for sure since they figure day is the 1st day of your period. I don't remember when mine was so they basically just guessed.
Count back 40 weeks from June 18th
I was born on June 17th and my mum has always said that I was conceived on my sisters birthday...12th september...tho I was late