Birth Control and Antibiotics....late period

so i had a UTI and my doc put me on Nitrofurantoin Mono. today is the last day of my medication and it’s supposed to be the first day of my period. i am on birth control (Brand: Junel Fe 24). my period hasn’t came yet and usually it’s right on time without any delay. could the antibiotic cause the delay or should i be concerned?? thank you all in advance!