PP period delay HELP!!

Katie • 30, HTX📍 Josiah Ray.👦🏻💙 2/19/19

So I’m a FTM & I stopped bleeding around 4wks pp & had what I thought was my period @ 7wks pp for about 5 days which is usually normal for me. My periods were so regular & on time before I got pregnant, so I was wondering if any of you moms have had a period then don’t have one the following month? Could my periods become irregular after a pregnancy? *side note I’ve used condoms or the pull out method every time I’ve had sex with my husband so I doubt I can be pregnant again! 😓🤷🏻‍♀️ + I am not breastfeeding!