Cramps before mis

Hi everyone. Looking for experiences from people. Currently mild cramping intermittent no bleeding and lost some pregnancy symptoms. Not feeling confident this is a viable pregnancy. Having a private scan tomorrow to confirm. My question is, How long with cramps before you actually bleed with the miscarriage. I’ve had a missed miscarriage with D&c so not familiar with time lines of cramps bleeding with a miscarriage. Preparing myself so Any advice would be appreciated