Pregnancy at 43?

I m 36 pregnant with my first child after over 1 year of trying and two miscarriages. We are so happy but also very cautious! My sister who has a 10 year old from a previous marriage, and three stepkids, is now dating a 31 year old for the last 3 months and they are trying for a baby!   It made me happy at first but now sad and angry! Can she just let me enjoy my moment for once? Thoughts? Thanks a lot!