H1B visa filing and pregnancy


I need an urgent advice. I am filing for H1B visa this year & I am ********,delivery is expected in Nov.

Is it a good idea to file for H1B this year?

Also, if I file H1B this year and gets approved effective 1 Oct then do I need to join first to take maternity leave if in US or I can directly go on maternity leave? Will my H1B status be affected?

How will this work if I am in India? will my H1B status be affected?