I 'partially' came out about ten days ago. I just couldn't hold it in any longer....
I don't know about your mother, but I'm having trouble seeing eye to eye with my mother, she hasn't rejected or accepted me. Now that my secret is out to her, I can't control her, I've asked her to not tell anybody, but she might.... spill it.... and I might regret it when it does happen.
Just look at it from every angle, evaluate all possible consequences of coming out.
My original plan was to come out much later, but I had a heated confrontation with my mother about something else...... and my emotions got the better of me, I had to shut her up somehow,..... and I ended up..... spilling it...... It was totally out of the blue.... she was shocked, so she shut up.