<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have been on birth control for nine years now and last month I was on antibiotic. I was suppose to start my cycle Tuesday instead Thursday through Saturday I had a brownish-red dishcharge. This has never happened to me and I have never missed my cycle except for nine years ago with my first child. I have taken a pregnancy test and it was negative, but I have been dizzy at times and feeling like my sugar drops everday. I have also been waking up to use the bathroom and I usually dont do that. I had to take something to have a bowel movement because it had been almost three weeks. Should start a new birth control pack tomorrow or wait?  <response>: Hi, Thanks for the query through Chat Doctor virtual clinic. I understand your concern. The illness the antibiotics you had taken cause weakness. Dizziness, weakness. Constipation is other post illness symptoms, which can cause delayed periods. abnormal menstrual pattern. Home pregnancy test of urine is best done after 8 days delay in periods. If you have done it earlier, please repeat it. -ve pregnancy test at proper time rules out pregnancy. - If you are using oral contraceptive at a stretch for 9 years, you can take a gap for a couple of months use alternative method of contraception in the break. - In case you had a break within 3 years, you can start with new pack of contraceptives on scheduled time... You have to test for pregnancy in case next period is also problematic. check for pregnancy go for MTP as oral pills are notorious for causing fetal malformations. Thanks. 