I was exactly the same...and still am, even if movements have changed now! Yesterday she practically did not stop moving, and today, just a few movements!
I even went to the delivery suite as I thought there was something wrong with my baby when it happened, and they put me on a monitor for 2 hours! and typical, baby did not stop moving there!!! made me feel so stupid...but at the same time, I was really reassured, and at the end of the day, that's what counts!
I'd say it's probably nothing, but if only for that, call your midwife if you get too concerned about it! you will get reassurance and baby might move more if you are not stressed.
From that day (delivery suite), I have made up my mind not to get worried anymore if baby was slowing down, and actually since then, it's been much better...maybe babies sense when we are stressed and don't move not to "bother" us???
call your MW if it gets too much on your head! But try not to worry too much: just like us, babies have days with, and days without!
hope it gets better
Mel xx