please help

Joana
Im 11 weeks Pregnant. But on February 18 I Went to The Restroom And I Wiped Some Brown Discharged. Of Course it scared me Since That has never happen to me. The Next Day It Happen Again but this time with a little bit of cramping and back pain. On Feb 20 I went to My Doctor and it said It was Normal To Some pregnant Women. But now its stared to happen more often and im not starting to like that. Yesterday I Had The same Brown Discharge the 3 times i went to the restroom. Today the same thing happen. But again with little cramping and back pain. Should i go to the hospital to get checked? This is the 4 times it happens to me since feb 18. Im scared i dont want nothing bad to happen to my baby.
Has this happen to anyone?