Car seat help!

Mommas help please.  Earlier this year hubby and I got a new Santa Fe, it was perfect for us and our two babies.  We have a 3 year old and 1.5 both still backwards facing.  Literally the next month I got pregnant again!!!!  😍😍😍😍😍, great...BUT another car seat isn't likely to fit.  Anyone with a Hyundai Santa Fe have 3 backwards facing car seats!?!?  We literally can't afford to trade-in, to get a van, nada.  What car seats will fit!?!?  And no, I am not willing to forward face my girls.