Heartbreaking 😪

Gessy
On May 20th I found out I was pregnant, it was my first pregnancy I was so happy, me and my husband have been trying for a long time. I was four weeks pregnant, but then on the 25th I woke up bleeding at five in the morning we rushed to the hospital and the doctor told me I lost my baby!!! 
We couldn't believe it were devastated😪
I have RH negative blood,I don't know my husband blood type but the doctor thinks  that the baby was positive, and the doctor thinks that that's cause a miscarriage.
Has anyone gone through this before? 
If yes I will like to know what's next, what's the next step?
Thank you we appreciate.