I think I'm pregnant but my belly or uterus is hard I get quickening feelings when I lay on my stomach or when I sit down I have headaches all the time when I sit my abdomen and lower back hurts... my nails are growing rapidly but I blow up really big after I eat and my stomach goes down a little in the morning but it feels heavy when I walk and everyone says I lost weight I think I'm 14 weeks is this possible ?