Baby movements

So im 20+1 weeks pregnant with my second baby and i have been feeling movements from around 16 weeks or ive been having very loud bubbly noise in my belly, since yesterday ive not felt any movement and im getting abit worried, i have been feeling like flutters but in my lower pelvic area & i dont know if thats baby kicking or not, i can't remember what happened with my first son, any advice??