Nausea

I'm just over 6 weeks and today is the first day I've had nausea. It's horrible. I feel like I have a hangover! Any thought of eating makes me feel sick. I'm struggling to get through work because I work for my father in law and I don't want him to know yet ☺️ I've tried drinking peppermint tea and eating pretzels (which is the only thing I've eaten today) and it's not working. Any suggestions? Will this go away or will it be around for awhile?