Could I be pregnant? Plz help

I’m 4 weeks PP, and I haven’t had sex. But my husband decided he wanted to cum on me (it was hot in the moment since we haven’t had sex in a while I wanted to please him..) anyways I was bent over and told him to ejaculate on my back, but he instead did it on my butt. It leaked down onto the opening of my vagina and I as soon as I realized I jumped up and went to the bathroom to clean up. Is there a possibility I could get pregnant? I’m scared to death and told him to never do that again.

I almost died twice after giving birth, plus had Postpartum Preeclampsia. We’ve decided to not have another baby because of all of this. Please don’t judge me.