It could be morning sickness but unusual to come appear so late. Maybe check with hospital or doc as it might be food poisoning?
Are you having any heart burn with it? I have terrible heart burn which makes me want to throw up big time! Get some tums or antacids like zantac and see if that helps. I also get sick if I eat too much since baby is push in my stomach up, maybe that too? Try eating smaller meals! :)
It morning sickness hun. It can show up at anytime