Please help! I need ideas ASAP!

My husband and I are doing our first FET transfer on Monday and we have been open with our families from the beginning about our struggle and our appointments. My question is- since they are expecting a yes or no to being pregnant, how can we tell them in a special way that may still surprise them? I don’t want to just call up and say “guess what”. This will hopefully (fingers crossed and prayers said) be our rainbow baby. We lost our son in 2020 at 12 days old after a hard fight in the nicu. We want this to be special for us all, so give me ideas! We should know for sure by Saturday so I’m just trying to prepare ahead of time! Thank you in advance!