Fertility treatment and work

Hiya, finally on my fertility treatment journey as reached my goal weight and I started a new job 2 months ago. Problem is I don't want to tell them im getting fertility treatment coz 1. I'll need time off and 2. They mite just let me go. I'm great at my job and we all get on well but tbh I don't want anyone knowing my business and asking questions about it. It's hard enough going thru it....Wot do u girls think I shud do? Xxx