Could this be a sign I have been sexually abused ?

My husband wants to try anal.

He has been mentioning for a while, but knows I am not up for it at the moment. Before we had sex last he asked me again and I said no. We were doing doggy and suddenly he pulls out (he says he was about to cum and wanted to go a little longer) and then he ‘accidentally’ pushed a bit into anal (not fully in at all) I shouted no again and he went out, but suddenly I realized I WAS SOBBING. It just came out of nowhere and I was crying so hard. He obviously stopped and kept saying it slipped and he’s so sorry.. but then later he asked do you know if that has happened to you before.. ? He was so worried, and I realized I have no idea. To the best of my knowledge he is the only man I’ve been with sexually, but suddenly I feel this pit in my stomach. Maybe as a child I was sexually abused??

On the other hand, I believe I was just crying because I was so calm and enjoying the sex and with total trust to my husband, and then suddenly I felt pressure on my anus when I literally said to him so clearly no.. and I’m supposed to feel the safest with my husband (which I normally do) so it was a shocking feeling for me to think he was doing something I have specifically told him not to do..

what are your thoughts?