Puppies try not to worry. MS can come and go.... some days you feel ok, other days you will feel yuck! It's normal i've been told...... try and enjoy it while it's not around!!
As for testing, don't use HPT's as even if your hcg levels are declining (which i'm sure they aren't!!) you will still get a BFP because you would have heaps of hcg in your body if that makes sense??? so it's inaccurate using a hpt and won't tell you anything iykwim??

I'm getting an 8 week scan to see the bub for the first time, perhaps you could ask for one aswell?? I'm getting it done for peace of mind too because I can't wait til 12 weeks scan!!! NO way!!