Insurance question

I'm currently on my moms insurance, but I have to get off of it soon because I got married. 
I also just got a new job and I'll be receiving health insurance. I start next Monday, but my insurance doesn't kick in for 90 days. I'm curious to know, If I get pregnant, will my moms insurance cover the first visit, until my jobs insurance kicks in? Will my job cover it if I'm already pregnant?