When to....?

Just started tracking here, I had a miscarriage on December 5th, confirmed... I was 9 weeks.

When should I put my last period as? Because I bled for two weeks after, almost three.

But I'm not sure what to consider that, because I didn't have a d&c, because my body was "taking care of it" on its own...

Anyway, when to put down last period???