My GF usually starts her cycle on the 15/16th of every month... She took Plan B and received her period 1 week later (2 weeks before normal) she went to the doctor which informed that this was due to taking Plan B and her next cycle could be a little late.... she is now 6 days late but she is not feeling any symptoms at all... Could she be pregnant or continue to wait due to the Plan B changing her cycle this month?