Late Period and Negative Test??


I am 9 month pp, not breastfeeding, and my period has been regular for the past 4 cycles. It has been between 27 and 29 days every time... I am on day 33 and no period. I took a test yesterday morning and it was negative though. Should I be worried or is it normal to not get a positive sometimes right away if you are pregnant... or maybe my cycle is just weird this month?? Idk what’s going on 🤷🏼‍♀️😫