every once in awhile sprout (i'm so tempted to start calling "him" eli after seeing u/s pics of face) has a lazy day. i don't know if your doc has talked about kick counts with you. my ob basically explained it as this (for when you're feeling worried).
have a cool drink and lay on our left side.
count kicks (even little ones).
baby should have 4 kicks in an hour. if you get 4 before an hour is up, you're done.
if you don't get 4 kicks in an hour, baby may be sleeping (usually 90 min. sleep cycles), so start over.
if you've gone a full 2 hours without getting 4 kicks within an hour, go to the hospital to get checked out.
i'm sure she's fine though what to expect says babies, like grown ups, have lazy days too.