Christine, I think for a lot of ladies m/s doesnt start until around 8 weeks or so, even though it started straight away with me.

i believe it has to do with the amount of hormones you are producing, if you are producing a heap, really bad m/s, producing not as much then no or little m/s

i wouldnt worry too much, talk to your doctor if you are worried, but I think you are completely normal!