Anyone experienced this??

So I got af on mon, right on time (15 dpo). It was super heavy for 2 days. It’s usually medium day 1, heavy day 2, then medium again for a total of 5 days worth.

Well. Today, (cd 3) I woke up to a dry tampon. This sometimes happens to me then I stand & go through a couple of them bc it just wasn’t flowing out. Well it’s 4, & I had some more spotting. But not my normal period.

I’m not asking if I could be preg bc I’m not. I will be 37 in March. Could I be premenopausal?!?!? Someone please tell me that’s not what’s happening!!!!