Great comment sarahkr. Makes a lot of since and explains a lot too! :)
Yes. its very normal. I'm 23weeks and 3 days and some days my little boy is super active then others he's more quiet and doesnt move as much. the more calm you are the more active your little one will be. the more active you are the more quiet he will be. when your very active and moving around a lot its like a rocking motion for the baby which will lull them and theyll be more relaxed and even sleep. when your relaxing the baby will be more active cause there is no motion to calm them. I hope this helped! :)