nausea

With my first baby I had pretty severe nausea that started at 6 weeks. With my second pregnancy I had no nausea and ended up miscarrying. I'm 5 weeks now with my third pregnancy and my hormone were normal at 4 weeks and I have a little nausea but so far nothing like my first. I can't help but worry something will happen this time too. Anyone have totally different nausea experiences with different pregnancies?