Seriously scared.

My son is turning 1 in July. He had a very traumatic birth, I don't want any children for awhile. A good 4 years at least. 
I'm starting a new job in August, we're trying to buy a house. 
We got in the heat of the moment and he didn't use a condom and didn't use the withdrawal method without telling me. He wants another baby, I don't! 
I noticed it was 4 days before I ovulated, so now I'm terrified that I might be pregnant. I know I won't know until later for sure. But I'm terrified he manipulated me into getting pregnant. We always use condoms or the withdrawal method 😫 Except that one time which I was unaware of. I got pregnant the first time we tried last so I'm sooo scared!