less and less of a period??

Andrea • Mommy of 1 and another on the way ❤️
Im a bit concerned about my cycle now. /: its changed a bit. I used to be a heavy flow and it would last about a week. It lessened to 3 days and super light. And its been less and less every month after. This time it came 2 days earlier and only lasted a day!!?? Any idea why??