Hi, My Last First Lmp Date Was 24 March And

hi,
my last first lmp date was 24 march and my pregnancy is 9 week 4 days according to usg report so I want to know what is my conception date ?I had intercourse in between 24 march to 24 april is 26 march and 14 to 21 april . plz tell me what is my conception date ?my period is irregular and I m also thyroid and pco patient