New job and just found out I'm pregnant

Well I certainly didn't think I'd be blessed enough to get pregnant so fast and as lucky as I am I also just switched jobs. 😳 
My question is, when did everyone tell there employers they were pregnant? I have been struggling with nausea thought the day and have been more emotional then I have ever dreamed possible. So I'm concerned they will know what's up before I'm really ready to tell anyone. 
Ps... I just found out last week (4 weeks along)