I also take a monophonic 24/4 day bc pill (Beyaz, in my case) and while I have skipped all 4 placebos before and just started my next pill pack early before (with my doctor's okay), I am not sure how much difference skipping one day of the placebo pill would make.
If you cannot contact your doctor today, I suggest discussing this with your pharmacist. If you call the pharmacy, make sure to ask to speak to the head pharmacist on duty.
Another potential way to obtain an answer is to contact the company that manufactures your bc pill. For instance, if you are taking Minastrin 24 Fe, go to the drugs direct web site (minastrin24.com). The commercial web sites like this usually have tools and resources, education kits, full prescribing brochures, FAQs, etc. You can also try calling the company and/or emailing them (usually under a 'Contact Us' type link, but you can also try Googling the company info).