How can I convince my husband to let my friend stay with us

A close friend of mine is pregnant and got kicked out of her parents house and has nowhere to go. She asked if she could stay with me for a few months. I want to let her because she has no where but my husband is extremely against roommates. We have had very shitty luck with roommates in the past and he's actually lost his best friend because his best friend moved in with us. Didn't help with rent like he said he would, made a lot of messes and when we made him leave and stole from us. That was all years ago and my husband has never let anyone move in with us since. He says if you really want to fuck a friendship up, become roommates. He lives here too. We both work to pay bills so him being comfortable in our apartment is just as important as me being comfortable so I'm not gonna do anything that my husband isn't on board with. Question is, how can I get him on board?