How long does nausea/queasiness last during your pregnancy?

I am now 8weeks and aside from mild nausea a few days ago, I don't have nausea and can eat all I want.

Back at 3-4 weeks it was awful and couldn't look at/smell any food!

Does it start out bad very early and lightens up as the weeks progress? Hate to think I'm losing pregnancy symptoms and my first ultrasound is not until 12weeks.