He won't answer...

So recently I've taken four different pregnancy test and blood confirmation from a my family doctor that I am indeed pregnant. And here's where it gets tricky, me and the only person it could've been will not accept my call my text messages. And I don't know how far is too and if I should message him mom, or maybe call him at work? I don't want to show up at his house and be creepy but I feel like this is major.