Hi, 31 Years Of Age, Standing 5'1, And Have 96.8

hi, 31 years of age, standing 5'1, and have 96.8 pounds. i started taking althea pill last april 17, 2016 my first menstruation, but i notice until now i still have spot on my underwear. was it normal for first time in taking pills? or should i stop taking right away coz its not good in me?