Feeling nervous to announce our rainbow.

Ive decided to post our first OB ultrasound next week (I'll be 7 weeks) and announce our rainbow baby to the world. I had a missed miscarriage at 16 weeks (only measured 13) last year and a coworker announced her pregnant soon after. I was upset for me but I supported her and was about the only one who asked her how she was while she was pregnant. Well now it's my turn again and another co-worker (one of my bosses) just had a blight ovum after IVF and her mentality makes me think that she will be very bitter towards me. How can I handle that in the nicest way? I would never harbor bad feelings for someone who got pregnant. She knows that my husband and I were trying and that Ive had my own miscarriage ans struggles getting pregnant. This baby is a clomid baby. Just dreading having to deal with her next week.