I enrolled in a Silver PPO plan on March 29th but my plan does not start until May 1st. Is there a waiting period for maternity benefits?

I have a question about the maternity benefits - I have enrolled for a Silver PPO plan and signed on march 29th. But my plan does not start until May 1st. I had previous coverage through my husband who lost his job and our benefits ended feb 28th. I want to make sure that I qualify and meet the 31 day period where I will not have to wait a full year for maternity benefits?

The Affordable Care Act eliminated pre-existing conditions starting 2014. Insurance companies are no longer able to deny coverage, charge more, impose waiting periods, or deny treatment for anyone with pre-existing conditions. The only exceptions are procedures like cosmetic surgery that aren't considered medically necessary.