I just turned 18 weeks today and I was wondering how active they are at this stage? Sometimes I'm just sitting down and I feel some type of vibration near my belly button as If something is wriggling in there. Is that what they mean by flutters? Just wanted an idea if it's the baby or not. I've noticed a little taps here and there but havent noticed like "whoa" moments. And also how many minutes/hrs are they active at around this stage when you feel your baby move? Pls and ty everyone :)