<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have really bad back pain , severe headaches, im always exhausted I get bad cramps almost everyday and i have been spotting almost everyday for the last 3 weeks. I just wanted to know if it is because of my birth control. It only started when i started my birth control pill for the first time.  <response>: Side effect of oral contraceptive pill OCP is headache, back pain, weight gain and thromboembolic manifestation. Cramps in calf muscle is not a good sign. You may be prone to deep vein thrombosis. I would suggest you to get a gynecologist opinion and tell her that you are having cramps every day. May be shell shift you from OCP to any other contraceptive method like intrauterine contraceptive device IUD 