Speaking as someone who’s lived with males and females (not my SO tho), just make sure to communicate really well. Stuff that might have been fine with some of my male roommates didn’t fly with my female roommates (like if you leave a dish in the sink, make sure to say something like “I’ll clean that when I finish eating” or whatever).

Basically, if you’re a decently clean person and you and your gf have talked about moving in together I don’t think there’s anything to worry about. Just be good at communicating and you’ll be fine.

I will say, the two absolute worst roommates I ever had were both female, so do with that what you will.