They do take a few months (or cycles) at least to get back to normal. If you’re really worried, have a chat to your OB or GP

First of all I think it’s quite normal that your period is different post partum.
When you do start your period again, chances are the first period after delivery won’t be like your periods before you got pregnant. Your body is once again adjusting to menstruation. You may experience some of the following differences:
cramping that might be stronger or lighter than usual
small blood clots
heavier flow
flow that seems to stop and start
increased pain
irregular cycle lengths
The first period after your pregnancy may be heavier than you’re used to. It might also be accompanied by more intense cramping, due to an increased amount of uterine lining that needs to be shed. As you continue your cycle, these changes will likely decrease. In rare cases, complications such as thyroid problems or adenomyosis can cause heavy bleeding after pregnancy. Adenomyosis is a thickening of the uterine wall.
Women who had endometriosis before pregnancy might actually have lighter periods after giving birth.
Give it some time. When you have concerns, then make an appointment with your Gp.

For peace of mind a visit to a GP is always a good idea.

Mine were very heavy and irregular and more often and I needed to see a GP and specialist just to make sure everything was ok. Everything returned to normal after several months. It is a good idea to get reassurance.

After all 3 kids i didnt get back to my normal for 6 months