Morning sickness a few dpo?

This morning I woke up and went to make a sandwich for hubby for work. The smell of the lunchmeat made me nauseous for almost an hour. I never actually did throw up though. I make sandwiches all the time and this has never happened.  I don't know my exact ovulation day, but I am anywhere from 2-5 DPO. I really want a baby, could this all be in my head or an early sign of pregnancy?