I have an irregular period roughly maybe a 21 day cycle. I also have had unprotected sex with my boyfriend for the past 3months. Around the 3 of September I had the suspision I might be pregnant, even though I still had no missed period at this point.Sept 7 first negative. On Sept.8 -11 I had an irregular period. Sept 19, second negative. Sept 26, third negative. I was expecting my period roughly around September 29 - October 6. I didnt get any period at all. Now on Oct.1 I had unprtected sex with a friend. ( I know I dont need to hear it all. Just please help me ) So what do you think my chances are that I conceived from that one day, which I most likely wasnt ovulating, compared to me and my boyfriend randomly throughout the past 3 months.