He slapped me 😢😞

Me and my husband got married back in July of this year and tonight we had our first real fight because he wasn't answering his phone for a period of 5 hours with a story that jus wasn't adding up... so when he picked me up from work we started arguing. He was getting really agitated and stopping the car suddenly and I hadn't had time to put on my seat belt. I'm 9 weeks pregnant so it made me mad and I toss my food on him. Then he slapped me. I can't believe it. He slapped me and now my face is bruised. He didn't even apologize and I'm so confused. Please tell me what I should do?!?!

Update: I don't excuse myself from throwing the food. I'm not saying I threw it cuz I was pregnant. Im saying I threw it because I got mad that when he jerked the car my stomach almost hit the dashboard. Like he doesn't care about our unborn child and I reacted by throwing my food. I know I was wrong but I don't think I deserve to be hit.

2nd Update: So as it turns out my suspicions were right. He was with his other child's mother having sex. He has now apologized now that I know the entire truth of what happened. I knew he was angry because he did something wrong. I could sense it and he took it out on me and his child. He has agreed to go to marriage counseling but I don't even know if this marriage is worth saving. I'm now almost 11 weeks.

And just to add because I saw a few of the comments.

-the food was a burger and bun and a small brownie( nothing that stained his clothes)

-we talk on my 15min breaks and 45 min lunch everyday for the past 5 months since I've worked this shift because I work nights and he is off.

-ive had 4 miscarriages so while holding my food due to my height the food was above the dashboard and my stomach sits directly in front so when he jerked forward my stomach would have been the first thing to hit it