Help with fertility/prevent miscarriage?

Tina
Needing some advice on help with fertility, different things that helped you get pregnant, or if there are ways to help prevent a miscarriage? I've had a blighted ovum that ended in miscarriage and I've also had another natural miscarriage. I have a 4 year old daughter so I know I can have kids but I'm not sure why I keep having miscarriages. Any insight would help a lot! Thanks!