With my first I didn't feel the baby move until 25 weeks. This time around at 18 weeks.
The placement of the placenta and position of the baby also make a big difference on when you feel baby which could contribute to why you haven't felt this one yet. Lots of women still haven't felt it by 15 weeks, it's normal.
I know with pregnancies after your first you feel things sooner but it's still more than likely to early. If you don't feel anything by 18-22 weeks then I would call your doctor. But I would have thought baby is just lying in a position where you can't feel yet x