Hiding morning sickness

LumpySpacePrincess • SAHM to 3 very cheeky monkeys.
I'm going to my dad's for christmas lunch this arvo. All my extended family will be there. I'm only 6wks so have no plans to tell anyone yet but morning sickness has kicked in majorly today and I don't know how I'm going to hide it. I've only been up for half an hour and I've already vomited 5 times. Any ideas?