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If you have unprotected intercourse after finishing with your periods, you are at risk of pregnancy as the time of intercourse gets closer to your fertile days/time of egg release from ovary. Your current symptoms (abdominal pain, back pain, altered taste in mouth, nausea, increased vaginal discharge) could be suggestive of possibility of pregnancy. Look out for development of any other new symptoms suggestive of early pregnancy. If you are having symptoms suggestive of pregnancy, or if you do not get your periods within 10 days from expected period dates, visit your doctor/gynecologist for further examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Take adequate rest. Drink plenty of water. Maintain healthy diet.
Take care.