Occasional muscle fatigue feeling around hip/pelvis

Au

FTM here I am currently 36weeks +1 day. I've been working on cleaning up and organizing the house today and just randomly started to notice feeling like my hip/pelvis area randomly gets a feeling like when you work a muscle too much, that kind of loose feeling?

I've had a pretty much painless easy pregnancy so far, so this new feeling just kind of threw me off a bit. It's not painful, I was just wondering if it's something to do with our little one dropping or something like that, and if anyone else only started to feel this feeling at this later point in their pregnancy?