I took his car😡

He purposely took my keys this morning so I wouldn’t go anywhere. Or Id have to ask. After we had an argument. So I ask for my key so I can come do some blood work. He told me to leave him alone. I ask for my key again, told him I need to do blood work. We have our appt in a week and they told me to get it done at least a week before. Anyway he says “now u need something” I said yes my key, or I will take your car because his key was on the counter. He tells me no but wouldn’t give me my key. So I left in his car. Now he’s blowing me up telling me to bring his car back. I told him I will when I’m done with the blood work.. I wish it wasn’t like this. I’m considering leaving this relationship. But we have a child and one on the way.

Update: thanks everyone for your comments and advice. Do you think it’s to much to give an ultimatum for couples counseling or break up? I’ve suggested counseling before, and he refused.