dd2 (6 weeks old) has thrush for the 2nd time, been giving her the drops that the doctor gave me last time but it seems to be getting worse, her mouth is all white and it does'nt seem to be clearing, it does'nt seem to bother her much, she is feeding ok even though a little soar. How long should i wait before taking her to the doctors? She has been having the drops for 4 days.