How long a miscarriage lasts? 😳

Hi guys, I’m scheduled to have a d/c this Wednesday (02/20) but I already started bleeding and I’m having some serious cramps. My baby died about a week ago and I started bleeding 3 days ago.

How long a natural miscarriage lasts? I’m afraid I won’t make it until Wednesday when I have the D/C....

* 7 weeks (but baby stopped developing at 6 weeks and 4 days )