Concerns about PlanB and it's relationship to period cycles

Patient : Hello! I took PlanB after having protected sex as a precaution on December 15th, 2014 and got my period on December 20th, 2014. Then we had sex again protected on January 11th, 2015 but I freaked out because I was prescribed new birth control pills and haven't been able to start taking them yet, so I took PlanB again on the night of 12th around 11:15pm. I've had some extremely minor cramping but no sign of a period yet. I'm wondering if taking two doses of PlanB messed up my cycles or if I am possibly pregnant because I am supposed to get my period on the 23rd but I've never had a regular cycle.
Symptoms:  Minor cramping
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