Unusual situation during Period

So I’ll get straight to the point.

I have started my period about 3 days ago. For over a year now, it has been a consistent 6-7 days long or medium to heavy bleeding, something normal. This cycle however, started off normal light-to-medium flow and stayed like that for the first day and a half. Now it has become almost nonexistent. For the past 2 days, it has become less and less frequent, almost to the point of spotting. Even after spending the whole day out, walking about, working long shifts, etc, anytime I’ve gone to the bathroom my pad would be mostly clean. When I first wake up and go to the bathroom, I usually gotta change a full pad and yet there’s barely a smidge on it. The blood is mostly dark and oxidized even though I change the pads regularly. It’s almost like a ghost period.

That being said, ever since the start of this period I’ve experienced a sharp acute pain on my lower abdomen, somewhere around my bladder. I feel an itchy almost tickle-like sensation in my vaginal canal, nothing crazy though, and the constant need to pee. At first I considered it might be a UTI, but I’ve had UTIs before and they were never painful like this. It was always just itchy and sore.

When I pee, my vaginal canal feels full, like it’s being stretched out, (similar to the feeling of having a speculum inside you) yet very little blood comes out; meanwhile my bladder is emptying little by little and everything is fine until the very last few drops of urine - that’s when she pain occurs. It hurts to the point I whimper.

After peeing, the feeling of fullness remains, but the sharp pain is gone unless I have to give a little push to expel that last bit of pee out. Otherwise, I feel nothing throughout the day, except that frequent need to pee or bladder fullness. I haven’t had any menstrual cramps, or any other discomfort apart from this specific thing.

I’m unsure what I’m experiencing, and unclear if I should seek medical help or if it’s something I can treat at home.

I’ve had a chat with ChatGPT in the hopes it would do a better job at researching symptoms than I ever could; but I figured I’d also come ask for advice out here.

Has anyone experienced this before? Any help is appreciated.

Obs.: I’ve started taking a couple of vitamins/supplements about a week before all this. Not sure if it’s related. Some D3 + K2, multivitamins with Omega 3 and Biotin.

TL;DR: My period started normally and now the blood is down to spotting — meanwhile, acute pain in bladder while peeing only! Not sure if UTI or something else. Please read full post is you can!