I am really sorry you are so stressed out right now.
1. Stop using credit cards. Period. No good can come of it. Paying interest on money you don't have is not a going to get you anywhere.
2. Get on assistance. Medical assistance. Wic. Food stamps. Something that can help you feed your family. Which is what I'm assuming you are using your credit cards for.
3. Your husband gets a job. A full time job. You two are young. Working on saturdays is hardly a national crisis. So he works on saturday for awhile, the world isn't going to end. What has he been doing all winter waiting around for a better job that wasn't going to get better until spring?
4. Do whatever you can to help your parents - help them clean, help them with yard work, etc. There are a lot of ways to 'pay' rent and helping is going to show them how much you want to be there.
I don't have any advice about your pregnancy. That is entirely your choice, but I will say that Planned parenthood has free birth control for when you are not pregnant in the future. IUDs are not expensive and you can get fitted for nearly nothing there. (if you are in the states!)
Good luck.