Telling family with infertility you are pregnant?

I just had a baby 7 months ago and I’m now 2 months pregnant again. It was not necessarily planned but we are very excited about it! My best friend and her husband have been trying for 2 years with no luck and my brother / sister In law have been trying for 7 years with no luck. They were both very supportive with my first baby but I can’t help but feel like this time around they will be upset? How would you go about telling them without it being upsetting for them?