My boyfriend and I have unprotected sex every time we do have sex. We only do his as I am on the pill. About a month ago, we had unprotected and I forgot to take my birth control for 2 days. I took on the 3rd day. I was also on antibiotics at that time, but unsure as to whether or not they affect my birth control.
3 days ago, I had some dark brown with a hint of red blood. It lasted for a few hours. Yesterday, I didn't have any, but today, I am experiencing it again. What is this and should I go see my doctor for this?