When to tell boss?

Shalena

I found out I was expecting jan. 5th and have only told close family. I work for toyota as an express technician so I do oil changes and rotates and stuff also it's 10 hours a day. it's getting a little hard cause I'm just tired all the time but my doctor isn't concerned with my job. I'm just wondering when would be a good time to let my boss no? today I'm 8w 3d. I really want to let my boss no and tell him that I'm fine. but I don't no how he will react.