Normally 7.5 weeks pregnant, but according to the gynecologist, 5.5 weeks.

I went to the OB-GYN on Friday.
I thought I was 7-8 weeks along, but at the next appointment it was only 5.5 weeks. We did see a nice gestational sac and yolk sac. Everything was okay for that stage. She's quite a blunt person. She said either everything is fine or it's a threatened miscarriage.
She told me that the worse I felt, the better! Since this weekend I've been vomiting again while brushing my teeth, and when I'm in the car riding with someone, plus peeing extra at night.
And since yesterday (a few nights of bad sleep because of my daughter) I've really been vomiting when I got up after 2 minutes, and in the afternoon sweating and having palpitations while working. I also feel weak and faint sometimes (sometimes I can't see properly). I sometimes also feel tingling in my lower abdomen and groin.
I have to go back next Friday.
Is this a good sign or am I just imagining it?