Is it obligatory to fast when a clear white discharge with a streak of blood appears at the time of a delayed menstrual period, along with symptoms of menstruation?

The blood of menstruation is a well-known flowing blood, black with a foul odor, and it is thick. It flows from the womb and is not in drops.

If a small amount of blood comes out, like drops or a thread, then this is not menstruation but rather from the veins. It does not affect the fast, and the woman's fast is valid.