When to be concerned?

I recently found out I am pregnant this will be my first. I'm now almost 6 weeks. The last two weeks before this I have been miserable with pregnancy symptoms just about all of them nausea, morning sickness, constipation, sore breasts, mood swings, food aversions, heartburn, you name it I had it. Now for the last 4 days I have had nothing at all my breasts are still sore but not as bad as they were but nothing else at all. I took another pregnancy test today and my lines showed up just as fast and just as dark as a few days ago (I'm pretty sure the color is maxed out on them now). But I am just "not feeling pregnant" anymore if I had to put it in my best words. The doctor will not see me until I am 8 weeks unless something is wrong. Is this something to be worried about??? I just don't know.