My mens started aug 6 and lasted for about 4 days. Had unprotected sex aug. 16. Took ist dose of nordette at 6pm and another dose 13hrs after the next day. No bleeding 5days after the dose as i expected. Sept. 1 had a bleeding and its not heavy. Few days before that i had spotting. Dark red colored discharge. That bleeding on sept. 1 lasted about 3days but its like heavy to light then heavy to light bleeding. I dont know if thats the withdrawal bleeding or my menstruatiom for that month. Did a pregnancy test few days after and its negative. I dont know if i should still be expecting my period for september. Help me please. Im kinda worried because my menstrual cycle is so regular abd i dont want to ezperience irregular menses. Thank you