Next choice pill on 12/15 and got my period on 12/29. i took next choice again on 1/5 and started another period few days later. normal?

Yes: Your periods occur because of changes in hormones within your system. While a lot of women have a period every month around the same time, there is variation from cycle to cycle. Ie – a period may come on a few days earlier or later and maybe heavier or lighter depending on the endometrium lining. It may come continuously or with intermittent spotting. These are variation of a normal process