Why is it literally the only time I feel extremely nauseous is at work now? I am fine on the…

Why is it literally the only time I feel extremely nauseous is at work now? I am fine on the weekends but Monday through Friday when I have to work I feel like I'm gonna throw up and pass out the entire time and by the time I get home all I can muster the energy to do is make it to the couch. ugh this blows. and I have like 14 more weeks of this. I didn't have sickness at all the first 2 trimesters and now all of a sudden blechhh.... 😯😵😳😖