If you didn’t know it was prohibited, there is no sin on you and no expiation! But if you knew that it was haram but didn’t know that expiation, your must give the expiation.

Sheikh recently I came to know the punishment for doing sex during menstruation.Last year I committed this sin unknowingly. I wanted to ask I did it when I was ignorant.so do i have to pay for its punishment.or will Allah forgive it as I was unaware.

Menstruation and post-natal bleeding | September 19, 2015 4:53 am
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I have extremely irregular pattern of my periods, this time i got my period on 8th bit then on 9th i saw nothing, i waited for blood to show and even today i saw nothing so i took a bath. Should i repeat my prayers of 9th?
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sometimes right before my menstrual blood flow starts, I will get things like pink discharge and so in the past, I would stop praying when I saw this as I assumed it to be the start of my menses. Was this correct and if not, do I need to make up those prayers?