When do you think I ovulated ?

Had MC on the 15th of august, still had positive HCG on the 18th of sept .. spotting on the 19th 20th and again on the 25,26, 27th .. I have never MC before and periods have always been very regular . I don’t use ovulation strips or temp.

Feeling nauseated today and very fatigued. Do you think there is a chance I am pregnant from after MC , or the fact I had spotting on the 19, 20 and 25,26,27 put me out ? I am supposed to be ovulating now but cm just doesn’t look like I am .