Had morning pill within 12 of unprotected sex week later had period on time but it was very light and brown went for 7days?

Could be due to pill: Morning after pill has very good protective chance from getting pregnant if taken within 12 hours. It is made of high dose of progesterone, a female hormone, and it might cause some changes of the period that follows. I would suggest to check for pregnancy anyway to make sure you are not pregnant, and if the period changes persist, see your doctor.

Normal: The logic in using the "morning after pill" would be unprotected sexual intercoursse with ejaculation. I suggest both condoms and spermicidal foam or gel aaand a GYN exam for definitive BC pills. Bleeding is from emergency contraception; however, do a home pregnancy test to set you mind at ease.

Not unusual: You may notice irregular, unpredictable bleeding of varying amount and duration after any hormonal intervention. For peace of mind do a pregnancy test one and two weeks after your episode of intercourse, hopefully, these are negative.