I'm pregnant, my sister miscarried.

Has anyone else been through this or have advice? My sister miscarried not long ago and I'm pregnant but I don't know how to tell her. I feel really bad because I know it's a sensitive subject, but I also feel bad keeping it from her...

Update: I told her and she's extremely happy! I guess I was over thinking it lol. I feel so relieved :) Thank you all for your advice and support.