Plan B vs. Pregnancy

Patient: I took the Plan B pill 2 weeks ago. I have been having the symptoms of early pregnancy.Are these just side effects of the pill? or does this sound more like pregnancy and I should be tested?My symptoms are:Tiredness throughout the dayNausea after eatingBackachesHeadachesCrampingSpottingSlight DischargeIf these could only be side effects, how long do they last?If it sounds more like pregnancy, how long should I wait before being tested?Thank You