How can I subtly hint that I am gay?

I am 19 year old girl and I have a girlfriend. My mom isn't homophobic, but sometimes what she says is and I do not know how she will react to her own daughter being homo. I am afraid to just go "hey, I am gay." Is there little ways to subtly hint that I am gay without being too obvious? Like, at the moment my gf is my lock screen photo so that alone can show it a bit. What else could I do to indirectly and "accidentally" show signs that I am gay?

2017-04-11T00:37:33.809Z