Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 6 months ago

As you did not know that your ritual purity was not valid when you performed your prayers, there is no sin on you if you had a valid reason of not knowing,  but you need to redo those invalid prayers. After performing those prayers,no your responsibility will be clear.