i guess she was bi?

At the Millstone I asked my grandma if our waitress was pregnant or just fat. She said pregnant but I was confused because when I used to work with her she was a lesbian. “Well, lesbians can be pregnant too you know!” “I know, grandma.” Still, I did not want to slip up and ask her when she was due if she was not pregnant. Soon I found out that she and her husband have a 2 year old and one on the way. I’m confused.