Baby movements??

Ma

So tomorrow I’ll be 13 weeks 6 days and for a few nights and today I been feeling like real faint type of what feels like a muscle jumping in my lower abdomen like right below my belly button to the left side. If any of that makes sense. I know people always say you feel flutters like butterflies when the baby moves now I haven’t felt that yet or that I’ve noticed but I do notice these. And it doesn’t happen all the time maybe like once every other day or twice a day. Is that like maybe the stronger movements or am I overthinking this? This is my first pregnancy so I’m new to all this