How come i dont feel it anymore?

i am 17weeks and 3 days pregnant today. Around the 25th of june, when when i stopped feeling the "flutters". I have left one good kick around the 2nd of july, i felt one movement, and ever since, nothing. between those dates i was down the shore, and went on once ride, it was kind of spinney but nothing armful. With my son when i was pregnant, he was surly a mover inside of me. Im worried! Anyone have any opinions? Thank you