What is my % of having another miscarriage after a miscarriage/or abortion?

Abortion done in the first trimester does not cause any damage if dont correctly. It does not hinder any future pregnancies. I know girls who have had 5 or six and continued to have a few babies. Your friend will be fine. As for miscarriages I have no experience with that and cant help you there but Im sure you will be fine. Lots of sticky baby dust to you!!