Who's the dad

[Nrain15]

I had sex with guy #1 on December 7th and 10th. I was with guy # 2 off & on thru December 15th - 25th. I don't know when my last period was I have irregular periods. I had a early ultrasound that gave me a due date of September 14th 2018. Was mostly likely the dad my due date is coming up & I'm so confused

[AnnieBrooke]

Hi, Nrain, how early in the pregnancy was your earliest ultrasound that gave you a due date, i.e., the one that told you September 14?

[Nrain15]

On January 24th the ultrasound said 6 weeks 5 days

[AnnieBrooke]

Second guy would be by far the most likely to be the dad, then. The first guy would be too early by about a week.

[Nrain15]

Okay thank you!

[AnnieBrooke]

Keep in mind that when the doctor says "x weeks pregnant" he or she is using a count that begins on the first day of your last period (or on a calculated first day of last period that comes from the size and development of the baby as seen on the ultrasound). If you had thought to ask the doctor when you conceived (not just how "far along" you were or how many "weeks pregnant" but actually "conceived," using the c-word) he would have told you 4 weeks 5 days prior to the ultrasound, because women don't conceive when on the first day of a period. All doctors, nurses, medical textbooks, and ultrasounds use this dating convention even though it is confusing and not too logical to laypersons. They begin the pregnancy time period with the first day of last period even though you don't get pregnant then.