Hi i had my period on 15th of December came off on the 20th my period lasted 5 days and I'm irregular I was heavy I had sex with guy 1 on 22nd of December once but had sex with guy 2 on 31st of december and the 1st of January around 5 times my due date is 26th of September who would most likely be the dad the ultrasound person said I conceived in January