Yes I would tell them asap also you need to be tested via blood test or swab. This went through my office when I was 10 weeks pregnant with my first child, I ended up being postive with it also and ended up having to work from home for 4 weeks. 2 weeks of that I was contagious but the last two weeks I was so sick I couldnt hardly move. Please please get tested as its highly possible you are positive with it, no one next to me in the office had it but someone on the other floor had it and thats how I got it.