What's your go to excuse when you don't want to tell people you are pregnant yet but you are dying of morning sickness and feel like your can't do anything?

I have been having trouble functioning with my morning sickness because it is constant and pervasive. And I've got some judgy people in my life that if I am not constantly doing things for them/doing things they think I should be I am being mean and lazy. But I really want to keep my pregnancy a secret until 12 weeks. I'm at almost 9 and it feels like forever. And I try to do as much as I can but the morning sickness is really awful right now. Not to mention the fatigue.

Not sure how many times I can say I'm sick before it's obvious I'm lying. I have been able to play off the not drinking because I recently started a job where I am up at 3am so I use that.

What do you guys say? Or do you just tell people. The temptation to tell them so they will shut up is very strong but I feel I shouldn't have to and people should just accept when I am not feeling well.