Symptoms come and go?

Agatha
Hey gals..
I'm nearing the 6 week mark and I'm wondering if anyone else's symptoms come and go?
I've noticed that mine are particularly bad in the morning - sore breasts, faint nausea ( or what I think is nausea? - doesn't feel like the typical 'I'm nauseous), I'm exhausted, occasional 'stretching feeling in the uterus. 
However, during the day - I am more or less fine and I can go about my daily business ...  Evening, it kinda hits again.... 
Thank God I have no bleeding! But the doctor did mention a missed misscarriage when I saw him (just bc he had to), as at 5 wks there was only a sac and no baby yet. 
My next sono is 6/30.by then I'll be 7 wks/1day. I don't know if I can't wait till then for reassurance that the baby is growing. The symptoms being on and off make me nervous. 
Any thoughts? Suggestions? Can anyone relate/feel the same with their symptoms? Thank u loves! Hope you all are feeling good! 
X