Thanks for posting your query on this website. I fully appreciate your concerns.
It is normal for the periods to be irregular for 1-2 cycles following withdrawal of pills. Delay by a mere one day in the onset of period does not indicate pregnancy
If your periods do not start within the next 7-10 days, consult your doctor who may carry out your pregnancy test, if required.
I am confident that you will certainly benefit from the advice.
May I assure you that I am always available for your assistance and will try my best to cure your condition to the best of my experience and knowledge.
Please feel free to revert back to me in case of further clarifications, if any.
HAVE A NICE DAY AND A SPEEDY RECOVERY.
Dr.(Col) R Karanwal