Accepting what a woman says about the beginning and end of a period

She went out for Hajj and her husband died; does she have to go back to observe ‘iddah?

Does he have to leave his wife if she does not become Muslim?

‘Iddah of a woman who did not know that her husband has died

The ‘iddah of a woman divorced by khula’ and her going back to her husband

Can Women in `Iiddah Go Out to Pray Tarawih and Go to Work?

When does the ‘iddah begin for a woman whose husband went missing then was found dead?

Woman in ‘iddah following the death of her husband going out to visit her children

Woman who is in ‘iddah following the death of her husband going out to the market place and attending gatherings for seeking knowledge

How to work out the months for ‘iddah following death or divorce, or fasting for expiation