This is exactly why I went to L&D Saturday night. But I waited all day thinking maybe she was sleeping all day or just being lazy and that she would start kicking up a storm any minute. But she didn't, I only felt her about 4 time from the time I woke up till 9pm, that's when I decided to call the answering service and my dr called back in like 2 mins, once she asked exactly what my day was like she said go to L&D right away. Because not only was she barely moving she was also not moving as hard as she usually does. But turns out she was perfectly fine, and had hiccups also when they did the u/s, I chalked it up to her just having a lazy day. Not even the coffee I had before heading to the hospital was doing any justice. I think she wanted to play hide and seek, a few minutes after I got hooked up to all the monitors I started feeling more movements but they were still random.
So hopefully that's all that's going on with your little one, I'm sure she's fine maybe she's in a position where you aren't feeling her movements as strongly. I hope you can get in touch with your dr soon and everythings fine.

KUP.