Awkward at work

I'm 11+4 and have my first scan on Tuesday. I'm looking forward to the relief of people knowing but I'm really nervous about telling a workmates who has been having <a href="https://glowing.com/glow-fertility-program">IVF</a> for some time now. 
I've been private about TTC so it will be a surprise. It's a small office and I don't want her to feel uncomfortable. Does anyone have any advice on how I should tell her? I want to make it as easy as possible for her although I know it will be hard. 
It's so difficult!