Misscarriage .. Can anyone relate ??? ;(

Kasia
Can anyone relate ?
We had bad news yesterday on emergency scan we found out is no heartbeat in our bean . On 12 weeks baby measured only just over 10 weeks so it happend over a week ago.
We choose to misscarry in natural way ? 
Can anyone relate and tell me
How long it takes to end whole process
ATM I'm only spotting Ans having strong cramps and that's day 3 ..
Anyone had similar situation ?