Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
No,
Brown spotting after intake of morning after pill is not cause for concern. The bleeding you had must be
breakthrough bleeding which normally occurs within 3 weeks of intake of morning after pill. This mostly means that the morning after pill has been successful in preventing pregnancy.
This breakthrough bleeding is less is quantity comparable to a period & also lasts for less days. so you should not worry all the symptoms you have are representative of breakthrough bleeding & nothing serious. The cramps you have are common side effect of pill.
Don't use a morning after pill or
emergency contraceptive pill too frequently. Use condom or regular contraceptive pill regularly as method of
contraception in future. Regular taking emergency contraceptive pills can cause serious problems like
irregular periods, ovarian hyper-stimulation syndrome & even infertility.
Refer to a gynaecologist for more queries
Don't worry you would be fine
Hope this information helps