eggs respawn. place one the min you get to the mtn and it will be back when you need 3.

I decided to try a new seed with H&H (my old home just didn't have the space for all the cosmetics). I ended up on "EGYPT" which has the vendor near spawn, all biomes handy, bosses less so. Lots of good choices for homes and scenic beauty. Handy meadows/plains transitions for farming in several nearby spots. I wouldn't want it as a beginner, though.