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Ultrasound Accuracy
Hello, I am planning to have an ultrasound in the next few days to determine how far along in pregnancy I am. The issue I am having is that the last time I was with my ex boyfriend was June 24/25. I had a period around July 31-Aug 3 since then. I have recently started a new relationship and we had an accidental break. I took plan B and a pregnancy test about 2 weeks after to be sure of the results. Imagine my surprise when it came back positive. The earliest I was with my current boyfriend was Aug. 16 and the last time I could have been with my ex is June 24. Can an ultrasound determine with accuracy when the conception date is and therefore who the father is? I am only worried since my parents have told me that apparently one can be pregnant and still have a period or two in the beginning.
Best Answer
Yes, you can bleed after being pregnant, but its most likely not a period. An early ultrasound (prior to 3 mos pregnant) is a more accurate date of conception calculator than a later one.
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In answer to your question, yes, an ultrasound would be able to tell the difference between a pregnancy that occurred before June 24 (or 29, given the long life of sperm in a woman's reproductive system) and August 16. Get the ultrasound this week, and you should be able to tell quite clearly. You're lucky the dates are this far apart; some poor girls are not dealing with a many-week gap but more like a week. And it helps that you are getting your ultrasound nice and early.
Your dates look like this:
Up to June 24-25, sex with ex (presume unprotected or why are you worried, right?)
Period July 31-August 3
New sexual relationship beginning around August 16
Condom break around [when?]
Pregnancy test "about 2 weeks after" [when? Especially, when in relation to June?]
Anyway, when you go in for your appointment, they will ask the first day of your last period. Right now, with just that date to go on, you are (as of September 10) six weeks pregnant using the medical way of counting, which is called your "GA" (gestational age) and begins at the first day of bleeding when you had your last period. They will confirm this with the ultrasound, and if the embryo looks like it is not a 6th-week embryo, they will change your GA to a projected or assumed GA, based on the size of the embryo.
Don't mistake that when a doctor says "You're 6 weeks 3 days pregnant," he or she is saying you are 6 weeks 3 days from conception. Using the medical method of counting, what he or she is saying is that you're 6w3d from the first day of your last period. Conception would be about 4 weeks 3 days ago, in that scenario.
When you get your ultrasound, be sure they give you an estimated due date (EDD). Then take that date and plug it into a conception calculator online, or just manually count back 266 days from the EDD on a calendar. That is when you would most likely have conceived.