Any way for a stay at home mom to make extra money?

I use to sell on this app, called MERCARI.. I sold things I no longer needed etc like eBay.. I made good money and it was a awesome way to get rid of things!! but they recently it banned me for a ridiculous reason, my sister lives with me and we obviously have the same address, she made a account and then the app banned us both and deleted our accounts claiming I had multiple accounts since there were two accounts with the same address. Ridiculous. They wouldn't hear me out and you can only contact a robot. I can't find one that compares and I won't use eBay either because they charge you every month even if you haven't sold anything. The post office is right down my road so I'm looking for somewhere where I can sell and ship or just anything at home, something I can revolve around my schedule. I don't do meet ups or have time to go out and all. But here's a little background on myself, I'm 20, currently 36 weeks pregnant with my first. My SO is in the Navy stationed in another state than I and constantly going overseas, he has a 6+ month deployment coming up after our little girl is born. Money is obviously going to be tight and I'm looking for a new way to make money at home and I'm finding nothing :/ how do some stay at home moms make money? And yes my so will be helping out, but I don't want to put it all on him.