L.B.
My body is being funky too. Even though I nurse on demand, full time and all that, I still get my period back. I bled for a few weeks after birth then stopped. About a month later I had, what I would call anyway, a fairly normal period. Ten days later I bled again. Then a month later, last week actually, I had another period. It was longer than what used to be normal for me, but it was definitely a period. Anyway, we'll see what happens next time.
Pregnancy is like resetting the cards. You might as well pretend you're a tween having your period for the first time. Your body just needs to figure out what the new normal is going to be.
Unless you're bleeding a lot, filling a pad in an hour, or you don't stop bleeding for a month, you're just fine. That's what my doctor told me anyway.
Hope that helps!