Jodi,
My 'all day' sickness started at about 6 weeks and got intense around 9 weeks. At about 7 weeks, I had 2 days of nothing and worked myself into a panic. I called my IVF nurse who laughed at me and said "well lucky you!...Just you wait!". I thought she was being blase about it. Well true to her word, 2 days later it came back with a vengeance! At my early pregnancy info night, one of the most common questions from pregnant ladies was why has their nausea gone away, only to find it return with full force.
Try not to worry too much. If you're concerned, go get a repeat BETA done perhaps? I did that for the first 7 weeks to alleviate my anxiety.
Dexter