Decreased movement

I'm 27.3 with twins. I have noticed decreased movement over the last 3 days. I have been up  for 4 hours today and my boy has moved three Times. My girl i have felt flipping a bit but quite active last night. The movements seem different now too compared to 2 weeks ago..  Thinkin it's because they have less room since they aren't as strong/hard movements. Anyone else?