weird thing

So I've never had an orgasm, and on here, I saw some people commenting on how well a hairbrush has worked for them, so I decided to give it a try. Well, I've done it a few times now, to no avail. But when I did it tonight, my vagina,like, clanked down on it, but I wasn't trying to do it. Just a bit confused over here since that's never happened before. Any idea why that happened?