After a miscarriage, when do you usually start the countdown to a period showing up again? Meaning, do you start tracking from the very first day of your miscarriage bleeding/spotting beginning? Or, do you start from the day of the actual miscarriage?

Just curious because I had a miscarriage on the evening of 7/17 (passed naturally), but the bleeding/spotting initially started on the evening of 7/15 (prior to me knowing the baby had died). I was 12 weeks pregnant. Now, I’m trying to figure out what day I should be tracking my next period start date from. Thanks in advance.