Hi carlie, I sooooo miss all that belly wriggling! My little one is six months now, and like K8's baby, she has slept through the night since 5-6 weeks, and even before then she would wake minimal times during the night.
When she was in my belly she was an active baby, but not excessively so during the day but mostly the late afternoons, through the evenings and night time.
Even now she sleeps 12 hours a night and another 2-3 hours during naps in the day.
So, to put your mind at rest, I don't think their activity now reflects how wriggly and active they will be when they are born. Good luck with everything xx