How do I tell him??

Update:: couldn't wait! My baby and I stayed in bed and told him this morning! I tried getting a video of it but my phone fell down LOL we are all very excited!
My husband and I have a beautiful 2 year old daughter and have been trying for a second for 6 months. It's 6 days till my period but I decided to test because I HATE NOT KNOWING. Well....its positive!!! He has no clue. Should I tell him before work or wait and surprise him?