Why do I feel like crying?

For literally no reason whatsoever. Like I was on my phone doing like nothing and then I felt like crying. I don’t have anxiety and I’m not depressed. I don’t really cry that often, but when I do it’s from overthinking stuff that’s happened throughout the day and what’s happening in my life.

But literally

Just now

I felt like crying.

There was no reason.

My period ended today so you would think I’d be happy.

Is this just a hormonal thing?