Shakey leg

We’re 3 weeks today (3+4 from DD) and bub sometimes has a shakey leg, not sure if it’s left or right or alternates I’ll try notice the next times. I don’t think it happens every day but it might. It’s not very often but I’ve noticed it maybe a couple of times today. We’re talking… around 2 seconds? Of course I’ll bring it up at his bext appointment but I am concerned. I’ve been googling.

Has it happens to other bubs and it was nothing?

I would feel this in the womb occasionally as well.