I finished a round of doxycycline 14 days ago. I was on the antibiotic for 10 days and continued to take my birth control during this time. I got my period a week before I was supposed to so I skipped my period week pills so that I would not get another period and took active pills instead. I continue to take my birth control regularly. But I've continued to spot. Pregnancy is not an issue. I have completely abstained since before I began the antibiotic. Is my birth control pill still ineffective? When after finishing antibiotics will my birth control become effective again without the risk of pregnancy? Do I need to wait for a period and begin a new pack of pills?