Hi there,i started birth control pills about 3 weeks ago,the ones that you use while breastfeeding .2 weeks ago i had a period of about 4 days,and last night i got brown spotting,it still there now when i go to the toilet,i do remember having unprotected sex in the first 7days of starting my pills,whats could the spotting mean now?it feels like cramps ,and lower back pain ,im also very tired with body ache.thank you