Discovery Health pregnancy benefit that benefits them

Imagine my surprise when I'm halfway through my pregnancy and my pregnancy benefit from discovery health isn't actually covering much.

I am supposed to somehow know what the Discovery Health rate is when choosing healthcare providers so not to get a shock when I have to cover the shortfall. Nowhere is there a place that I can go to know how much they will cover for each consultations.

I am 5 and a half months pregnant and stressed because I have to cover expenses I didn't budget for.

Thank you Discovery.