Starting a new business while pregnant.

I love to watch "Shark Tank." One thing I learned from this show is that a lot of successful entrepreneurs started their business while they were pregnant because they had to leave their job and stay at home. I'm thinking I want to do the same thing.  I've been stressed out about how to make money from now on. I plan to stay home after the baby is born. And I don't want my husband to be the only person working. We're used to having income from both me and him. It'll be a little strange to have less money now that we're having one more person added to the family. Did anyone start a new business while they were pregnant? What kind of business do you have? I'm thinking about selling T-shirts online. Do you think it's a good idea?