I am 28 wks and 3 days my lmp was calculated thru ultrasound because i only remember spotting 3 days of november 15,16,17 than it stopped no actual period and got sick in dec on the 21st got first ultra sound jan 12th which i was 7 weeks 3 days i had only slept with my husband until we had a fall out and i slept with my exfriend now only 1 time which was on dec 12th 2017 so exactly who could the father be to my unborn baby i am extremely stressed over it just trying to figure it out on my own and my periods are irregular im not exactly sure how my cycle works cause its always random and there are times i wont get it for two months at a time so plz help me