Miscarriage on sept 25

Would you consider the two days of spotting the start of the miscarriage (sept 25) or the 27th when bleeding started to “flow” as first day of miscarriage?

Trying to calculate ovulation. But if I go from 25th, I’m cycle day 15 (no sign of ovulation, negative OPKS) and if I go from 27 I would be cycle day 13 and approaching ovulation but still.. negative OPKS.

Help a mama out.

When did you ovulate after miscarriage? And what day is considered “day 1”