Are these symptoms pregnancy or???

I’m 4/5 weeks and I’m already nauseous. My friends saying that it’s too early for these symptoms so is it a stomach thing? I woke up at 5 am queezy. Last night at a restaurant, my husband ordered some nasty peanut butter dessert that I smelled instantly and was entirely too overwhelming and I became nauseous. I too feel like it is way too early to feel like this. Thoughts? Send help 😂