Announcing to parents across country

My dad and my step mom live across the county from me. I recently found out I’m expecting and am waiting til March to announce. My problem is that I am not sure how to announce it to them in cute way. I’m thinking about mailing something and having my sister FaceTime but still not sure exactly what to send. Has anyone done anything like this before? Anyone have ideas? Thanks in advance!

(Posting anonymously because I know people on here and don’t want to spoil it yet!)