Car seat space... need opinions

I have baby #3 coming.

About 3 months ago we traded in my car for a different car. Then we find out I’m pregnant.

I have a 4yr old that is off and on in a booster seat cause she still throws fits sometimes and she’ll unbuckle herself

I have a 2yr old.

And now this baby coming.

Should we keep my car and squeeze the kids together. Or should we start looking for a bigger vehicle. I recently have been really liking the Honda Odyssey vans but with us just turning a car in for another well I owe $10k more on the vehicle 🙄

So kind of stuck on what to do. And I’m also worried if I do get a van what if I change my mind lol but I would like for my kids to be comfortable and I would like to have space for groceries