Period question/concern!?!?

Courtney • 27. Married 10/15/16 💚👰🏼👫 Leilene Rose 10/09/19 👶🏼 Tytus Matthew due 12/7/2021

Hey y'all. For the past few months my period has been starting a week later than the previous month (so 5 weeks). And this period, I started on Tuesday the 15th and have barely bled. (Which is not normal, I usually have a medium flow and one day heavy). Should I be concerned ? This has never happened and I'm 23.

Side note: my period only last 4 days, so I'm done after tomorrow. "Should be"

Thanks!!