A bit of guilt

I've moved to the UK, my emmidiate family is back in the states. I am now 12 weeks 3 days along but feel guilty sharing pics and updates bc my sister had a mc a while back. I had one to in jan but now blessed to be pregnant soon after. Why do I feel guilty to share things with her when she seems excited about my pregnancy?
I've never really been the type to boast about myself but I know this is something I should be openly enjoying