When do you tell co-workers?

I am 6 weeks and Army, so I work with mainly guys. I am not telling my coworkers until around 12 weeks when I feel that it is safe. 

I do have morning sickness and a pretty demanding Cna job taking care of stroke, spinal chord and traumatic brain injury patients.. There is a lot of heavy lifting involved.... I've already let most of them know since the morning sickness is effecting my day to day activities... It was kinda nice i started spotting on Saturday while at work and was so worried everyone rallied around me and gave me so much support and reassured me that everything was going to be ok with personal stories... Baby is healthy and fine but it was still nice to have a support system in place. But then again I work with a lot of women

The standard 12-13 weeks for me since my symptoms are mild and I sit at a desk all day.

I work at an engineering firm as well. But I told one trusted female coworker. It's nice to talk to her about it though our the day! 

Some know because infertility was a long road, the rest I'm telling in a team meeting next week at 10 weeks

Intold my teaching assistant along with administration due to my students who hit. Two have guessed because I look fat? Ugh 

I work for family. Like my aunts, uncles, cousins, and grandmother lol. I plan to tell them at 12 weeks but it may end up being sooner because my morning sickness is so bad and it seems like some of them are already suspicious.