I can't help with he Braxton hicks sorry as I didn't have those, but my first really strong kick from one of my twins was at twenty weeks, and I hadn't really felt anything before that! I nearly jumped out of my skin as it was a real boot in the stomach (which she still does now given the chance, from the outside). Both my placentas were anterior and I was also told it takes longer to feel movement with those. I don't think you need to worry about movement at all at this stage especially as both babies were healthy on your scan.
Also as you're a worrier please don't be worried by my very unusual signature, my situation is not the norm!
Good luck x
This post has been edited 1 times, last edit by "rb76" (Jan 3rd 2015, 1:00pm)