Gf upset

I have finally orgasmed with my recent gf on top of me. I finally did and told her that it was amazing and that was the first time I came with her on top. Now vshe is upset that I said it was the first time she ever got me off like that and not the first time ever I got off like that. I may have orgasmed like that in the past but can't remember if any girls got me off that way. What do I say to her now? She is really making an issue of it. I never meant to say it in a demeaning manner. Just to complement her because I just let go and let it happen. I usually only orgasm in certain positions or oral.