Presently I am 14th week pregnant. I have been feeling baby (like something is in my stomach and vibrations) by touching lower abdominal in the time of 13th week of pregnancy.
But suddenly I lost my feelings from yesterday. Now I don’t feel any vibrations by touching lower abdominal and feeling like nothing is inside my stomach. I am afraid. I am trying from morning to get that feel again but I didn’t succeed.
Is it normal? If I get Fetal Doppler can I hear my baby’s heart beat at 14th week of pregnancy?

At 14 weeks, you may not have been feeling the baby itself - it could have been anything from gas bubbles to who knows what. But since you're worried, I think it makes sense to call your doctor and go in to be checked so they can put your mind at ease.