prevent miscarriage with PCOS?!

Chloe • 2 angel babies 😇 😇 ❤️ 1 baby on the way 👶 💕
I'm 3-4 weeks pregnant!
Miscarried 7 years ago at 8 weeks (didn't know cause).
Diagnosed with pcos last year.
How can I prevent and do everything in my power to prevent miscarriage???