The doctor pressed my stomach really hard to find where the baby's head was at, since then I haven't felt a movement from my baby and I'm really scared. Should I be worried? Should I go to the emergency? Please help!
Not feeling movement is a cause for concern and you should seek immediate help if anything concerns you.
Certainly if you have a concern the internet is the last place to seek medical assistance as whoever responds will not be able to examine you nor will they be aware of your medical history. Not feeling movement for a number of days should be a cause for concern.
It is very unlikely that anything the doctor did will have harmed your baby, but that doesn't mean that everything is well either. Your doctors / midwives should have given you lots of information on signs to watch for at different stages of your pregnancy.
http://www.countthekicks.org/ has some additional information and an app which can help you track your baby's movement.