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Many of my patients have a delay in the return of their normal menstrual cycle when starting a progesterone only pill (POP). So what your experiencing is within the normal range. However, you do not have to wait for your next period to start the combined birth control pill (CBCP) as long as we know you are not pregnant. The simplest way to do this is to have a pregnancy test (PT). A Urine PT is accurate (i.e no false negative) if done at least 10 after your last sexual encounter. A blood PT is accurate if done at least 3 days after your last sex. Once you have negative results of the PT you can start the CBCP. However it is important to realize the CBCP will need a back up method (like condoms) for at least the first 10-14 days. Its also a great idea to use condoms all the time as the BCPs do not protect against sexually transmitted infections (STI)
Let me know if you have any further questions regarding this question as my goal is to make sure you are completely satisfied with your answer.