Have insurance but this baby is costing a lot

So I have health insurance thru my job. Supposedly it's pretty good insurance... So far I've only had 2 Dr appts ( I'm almost 12 wks). This week I've received 2 bills for a total of about $600. I'm just wondering how I'm supposed to afford this whole pregnancy if I'm being hit with $600 bills every few weeks.

Is there something I'm missing? What is your insurance like?