H1b approved and effctive from oct 1st but needs maternity leaves

HI , I need an urgent advice. I have an approved H1b which is effective from oct 1st 2013. But I am pregnant and and delivery is due is december. There are some medical complications that I am facing. Is there a possibility that I go on maternity leaves fom oct 1st and join in Februaury . Is it necessary to join first and get a paystub to go on maternity leaves . Please advice

If you are in india. You need NOT join.

If you are in US if the petition is approved with COS you need to join.

If petition is approved without COS you need NOT join.