Vianna, My OB always said that first time mum's may not feel movement up until 25 weeks. You can always talk to your OB if you're worried.

I felt DD at 17 weeks (only if I layed on my tummy) and then by 20 weeks it was kicks. DH felt her kick him at 20 weeks.

With Beez, I've thought I felt him for about a week, but I can definately feel him now. It feels like he's rolling or pushing out. Occationally I'll feel a 'pop'.
I'm 13+4w