<s>[INST] I am 25 years old and have been on BC since age 16 with normal periods lasting 4-5 days. My husband and I have sex regularly, but aren t trying to get pregnant. However, my last period was only spotting and only lasted a day. Since then I ve had a constant headache , and now getting lower back ache. However in 2 weeks I ve had 2 negative HPT . Am I pregnant or is this just a strange month for my body? [/INST] Hello. Thanks for writing to us. Not having proper periods while taking a birth control pill regularly is a common finding. You need not worry and should continue taking the pill as usual. The normal periods will resume in one or two cycles. I hope this information has been both informative and helpful for you. Regards, Dr. Rakhi Tayal drrakhitayal@gmail.com </s>