hi just want some advice

Hi goodday to everyone who read this Im 16weeks and 3days pregnant to day going to 4months and 1week on tuesday.. Ngayon po, nakakaramdam ko ako ng paninigas ng puson, di ko sure kung si baby yung or what .. pero yung pakiramdam ko po para syang lalabas kasi matigas yung puson ko.. Is it normal?? Hope you'll help me