Rubbing girlfriends belly?

Okay this is gonna sound weird, but a couple of days ago me and my girlfriend had a pregnancy scare, kind of a freak accident situation, and then she had her period, but ever since then I've been rubbing her belly, almost like an instinctual thing, I can't really explain it, I was watching TV with her today and I was laying down with her and I just couldn't stop rubbing her belly, it was weird, it's not a fetish of mine and I've never done it before, does it mean she had a miscarriage and it's just some kind of fatherly instinct still present? Or is it just me being used to the idea of her being pregnant? Or is it just some weird new quirk? It's kinda weird and won't leave me alone.