16 weeks and i dont

16 weeks and i don't even feel like i pregnant.. last Sunday i guess you can say i was attacked some random guy jumped out his car and decided to punch me n i landed on my stomach i got checked out the baby was fine and everything was good but since then i havent really felt pregnant and i useally would feel the little flitters n little kicks but not lately. ... i have no little baby bump i have gained no weight is this normal im a FTM