Two and A Half Weeks off Birth Control

Sierra
Hey there everyone!! I stopped my birth control,which was Nexplanon, on May 3rd. It's only been a little over 2 weeks but I'm getting worried because I haven't started my period yet. I have cramps every now and then,especially after sex, but no bleeding. 
Is this normal? I've heard of some women starting the next day. I had mine in since August 2014.