Any tips on concealing morning (all day) sickness we work?

So I am 7 weeks pregnant and SO sick. I am vomiting more than once a day and having some other digestive issues. This has me in the restroom a lot and people at work are suspicious (I think). Only my boss knows I am pregnant. I don’t want to tell anyone until 12 weeks because I have experienced loss. Any tips on concealing morning (all day) sickness we work?