I've been so paranoid on and off this time around, as symptoms are different to my last 2 pregnancies. All 3 of mine have been very different though -
With DD I was sick a couple of times a day until labour, had really sore breasts from the word go, metallic taste etc. symptoms were unpleasant but manageable. Had SPD from about half way through.
With my son I was violently sick from 6 weeks and in and out of hospital with HG. No breast soreness (but I was still bf'ing DD at the time) and awful SPD from early on. My baby was very poorly though, and we lost him at 17 weeks.
This time, I'm almost 12 weeks, and I've got faily constant nausea and the metallic taste but I've only had 2 vomiting episodes in all this time. The tiredness is worse than anything. My breasts ache occasionally and I have no sign of SPD (yet).
I'm not taking the lack of sickness as a bad sign, we've had 2 early scans and all seems to be going well so far. I had the worst sickness last time, thinking it was a good sign, but it didn't end well. If I had a similar preganancy to my last one, I'd be really worried now.
We were a little concerned following our scan at 6+5 as we were quite sure of our dates (ov'd on time or early, but def not late) and they dated me at only 5+6. Went back at what then should have been 9+5 and they bumped us forward to 10+5!!! Good luck x