21+3...

At what point is too far gone to not feel movement?? I'm 99% sure I've had the odd little kick or flutter but nothing massive or consistent.. what point so I call up to be checked?? I haven't been seen since 19 weeks.. and won't be seen til 24+1 .. I'm expected to have consistent movement by that appointment.. I just can't see it.. I'm so worried he's stopped growing 😫

I do not have an anteria placenta.. scans confirm it's placed at the back