It's a sign na healthy si baby kapag gumagalaw po sya. When it comes sa paninigas ng tyan, kung hindi naman magkakasunid ang interval ng pagtigas at wala ng discharge then it's okay. Nagpapractice lang ang katawan mo para kapag naglabor ka na ready na katawan mo.
Yes it's normal po. My baby was very active as well when I was preggy.