How to hide pregnancy from company

Hello. I am planning to start a new job and get pregnant too. But I don't wish to tell anyone before 3 months pregnant. I am a very superstitious person, hence would like to wait till 3 months stable. I'm afraid my morning sickness will expose me. Can anyone please suggest what can i say if i happen to feel nauseous? My previous morning sickness wasn't so bad. It's only bad when I smell some specific foods. Usually first two mths, it's hard to tell what kind of food i feel nauseous. That's why I'm hoping for some advices which i can tell my colleagues. Thank you so much for helping. 😁