I know there is the slightest chance it could happen, but never to me! 
Sorry if this is long or doesn’t make sense I’m genuinely curious about this topic 
My cycles last around 28-30 days my LMP was the 21st of September as per usual 5 days long.
However my body is strange not sure if it’s normal or not but 4 days after my period finished I ovulated and that was that.
Come a month later missed my period as you do done a clear blue digital and it came out BFP with 3+ weeks on the indicator 
Went to my dating scan and the Sonographer told me I was 13w 0d exactly which makes me conceive on the 23rd September thought I was 12w 2d along (this was 16th December)
(No sex during period although I know sperm can live in side a woman’s body for a certain amount of time)
Has anyone ever conceived on their period? Was you in shock? How did you feel about it?