I took the morning after pill on the 27th of

Patient: I took the morning after pill on the 27th of May, and commencing the 3rd of June i had a period but it was extremely light. This morning, 15th June i have found that i am having another period type bleed with stomach cramps etc. Is there any reason that taking the morning after pill could have caused two periods in one month?Thank you in advance

Doctor: