Hello, You are suffering from pain in your stomach on the left side below the rib cage. Pain is also there just above your belly button. You are having nausea, headache, You are a day late to period and are having watery orange color discharge. You can take antacids for relieve. Take adequate amount of water and fluids to keep yourself well hydrated. Since you are sexually active and you do not use birth control pills or condoms, you are suggested to get clinically examined by a Gynae. Get per vaginal check up done to detect bulky uterus. Get urine /blood test for pregnancy done. Our gynecologist may order a USG (Uterus with fallopian tube) to confirm pregnancy or to detect ectopic pregnancy. You will be accordingly treated. In case you are not pregnant you will be told to get done few blood workouts and imaging tests done so that your treatment can be done at the earliest. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician