Periods

I’m just wondering if it’s normal to have irregular periods 8 months after giving birth? I got my period 3 months after (not BF) and they have been consistent every month since and I’m due on today but no sign of period. I’m using condoms as a contraceptive as I didn’t want to go back on birth control as we do want another baby in the future. I’m pretty sure none have split so don’t think I’m pregnant but just wondering if irregular periods are still normal at this point?