How did nausea start for you?

So about two days ago mid afternoon I started to feel a little queasy and from then on everyday I've felt nauseated. there are times where my mind is occupied and I feel fine but as soon as my mind Is free, all of a sudden I'm nauseated again. Is it just me or is the nausea kicking in? And when I dont eat I feel nauseated but I don't even want food and I full because I feel nauseated. Get it? Please give some of your experiences. Currently 6 weeks + dont know exactly as I have my first ultrasound this Wednesday coming up!