I think my girlfriends vag smells like...

I think my girlfriends vagina smells like those chicken in a biscut crackers. only when she's turned on though. its weird... But i love that smell. It even tastes like it sometimes. I don't know why but it just drives me crazy. is this normal? and dont worry its not a hygiene thing on her part, we are both very clean people, and eat well (most of the time) oh also i am pregnant, so do you think that could effect the ay her uhm.. smell effects me?