If you get the post bleeding for 40 days and then you see your purity, you should take ghusul and pray.

The purity is realized by either seeing a white thread like discharges or by complete dryness.

If the blood returns after that, this is your menses.

I gave birth to my son and after 40 days my blood stop few days and then return. I finish that 40 days but I see some blood.what should I do?

Menstruation and post-natal bleeding | March 7, 2014 4:35 am
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When does a girl know that she has become pure after her period?
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Can you explain when is a woman considered to have started her period, when she is sure that blood came out or when the blood actually comes out because she might not check for a while and then see blood after having prayed?