10 days delayed after diane 35

ive been using a birth control for 2 years then just last month i stop using it because its giving me a side effect now witch is severe migraine. my last period was june 17 after 2 weeks i had this brown discharge or should i call it spotting? its not red. and then after 1 week i went to doctor because i had this back pain and my doctor told me that i have a UTI so i took amoxizillin for 4 days. me and my husband were using condoms and withdrawal method. just this july 17 we had a contact and withdraw it inside me because of this 10 days before and 10 days after thing. and now its july 27 and i dont have period, last time i had pregnany test was july 23 and its negative should i wait for few days to make a test again?