Heavy periods since giving birth

I am wondering if anyone has the same problem as I do or know what i can do naturally?!

Since I gave birth to my son 17 months ago (didn’t have a period after for 4 months) my periods have been a lot heavier than ever before I was pregnant. There is also some large clots. It’s always same time of month and close to same amount of days. 🤷🏼‍♀️. We haven’t prevented getting pregnant again but it hasn’t happened so I’m confused and kinda worried. I can’t find anything about it online no matter how many different ways I look it up.

Any advice? Thank you!