Periods seem to be getting shorter

So, I’m currently on my period now and the last 3 ones I’ve had they just seem to be getting lighter, however the pain is well and truly still there!

Was just wondering if anyone knows what it might be or experienced the same thing? It’s just so weird for me cause I’m used to really heavy periods and then I went on the depo shot for a bit then when I came off of that I didn’t bleed for 2 years!! And I only started getting my periods again last November and the first couple were mid flow, weren’t super heavy but not as light as I’m getting now, I’m only on my 3rd/4th day and there’s barely anything there!! But like I said I’m still doubled up in pain.

Just confused as to what’s happening in my body as I’ve never experienced this😭