On the bright side, my experience was that the symptoms / slowdown / etc. didn't get worse in a linear fashion at all. I felt basically the same from 20 weeks straight through until 30 weeks or so, and it was only after that when all the late-pregnancy symptoms started to creep up on me.
It was around 20 or 21 weeks that I noticed my body's lack of response to any sort of sudden aerobic demand (e.g. needing to get up stairs quickly), so you might already be feeling that. But it wasn't until 33 or 34 weeks that the occasional hip twinge turned into 'you need to be careful with those hips', and it still isn't SPD. (Also, I did go to my osteopath when I got very early hip twinges, and whatever he did sorted me right out until late pregnancy. Sadly he is in Oxford and I am now in Zürich.)
As for movement, one of the weirdest moments for me was during an ultrasound, when I saw the baby slowly lift up a foot and knew a kick was coming - your instinct is to flinch, but to flinch how exactly?
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It was around 20 or 21 weeks that I noticed my body's lack of response to any sort of sudden aerobic demand (e.g. needing to get up stairs quickly), so you might already be feeling that. But it wasn't until 33 or 34 weeks that the occasional hip twinge turned into 'you need to be careful with those hips', and it still isn't SPD. (Also, I did go to my osteopath when I got very early hip twinges, and whatever he did sorted me right out until late pregnancy. Sadly he is in Oxford and I am now in Zürich.)
As for movement, one of the weirdest moments for me was during an ultrasound, when I saw the baby slowly lift up a foot and knew a kick was coming - your instinct is to flinch, but to flinch how exactly?