my period is late!!

Brittany

I just had a baby I'm April, she is 6 months old. Now my period is 9 days late. I'm not asking if I could be pregnant, I just want to know if it could be that my cycle is just not back to normal after having my little girl? How long does it take for your cycle to get back to normal after having a baby? And I am going to take pregnancy test tomorow.