Am i stupid to worry??

Sabrina • Hii im curreently pregnant with my 2nd child and im due on 03/12/2015 x
Im pregnant with my second child ive been for my first scan everything fine but since then i did have pains for like 2 days and now im 15 weeks and 3 days and dont even feel like im pregant .. Has anyone else experienced this before or am i just over worrying to much ? :/ x