Orgasm

I'm currently about 6 months pregnant and last night my partner went down on me before sex because I've been having trouble getting wet. I usually don't like it too much because he's usually so gentle I can never reach an orgasm. This time he was fingering me and decided to gently rub my ass and slowly, very slowly, inserted his finger. When he did that I almost immediately had a mind blowing orgasm, probably one if the best ones I've ever had (we've been together about 10 years). Does anyone know why this would be? I've never been interested in anal sex but now I'm kind of wondering if I would actually enjoy it. I also am wondering if it was just a fluke because I'm pregnant.

I'm a little worried that I enjoyed it so much he's gonna push me to try anal.

Has anyone else experienced this while pregnant? Thanks!