In weeks 18-20 mine felt like bubbles in my stomach. Everybody told me I'd feel flutters but I didn't rele no Wat that felt like. Someone finally told me it feels like a bunch of bubbles in ur stomach nd I'd been feeling those for a couple weeks I just didn't no it was the baby. Later on starting around week 22 you will be feeling actual kicks. U won't be able to mistake those at all
Trust me you will know. When it happens the first time it will feel weird almost like a little muscle spasm. But then as you get further along you won't mistake it at all. And then towards the end it will be Soo strong and almost uncomfortable at times but Soo rewarding. You'll love it.
I didn't feel any flutters at all or at least to my knowledge but at 16+4 weeks I got kicked hard. Trust me you will know