I did mutah with a man during menstruation for one day. And we had sex only once during menstruation . Will this menstruation count as first haiz of two haiz of idat period? Or have to restart iddat after this menstrual cycle finishes?
To have sex during mestraturion is Haram and holds a kaffarah.
This period, during which you entered into a mutah will not be counted as your first cycle for Iddah, the next one will.