Accurate dating sonogram Lesdians

If your first ultrasound gives you a due date that is more than 1.2 weeks away from what was expected, there is a good chance that everything is still fine.You may have simply conceived earlier or later than you thought you did (which can happen if your cycle is at all irregular or if you remembered your last menstrual period date incorrectly).

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He used a condom, I believe I was on birth control (but cant remember for sure), and took Plan B 55 hours later.

I had sex with another partner unprotected for the month of Feb - currently.

Given this information, would it be possible that all of my ultrasounds were a month off and I conceived Jan 18? Based on this EDD, the last date of your period would have been 5th of February.

Could the birth control not have worked in Jan, the embryo lived through the withdrawal bleeding, and the fetus has continued to measure small throughout the pregnancy? According to this period date, the most likely date of conception would be around 14 days after the period, that is around the 19th of February.

Every pregnant woman wants to know her due date, and a due date that is calculated from her last menstrual period often doesn't match the due date that is estimated by her first ultrasound (also known as a sonogram).

During an ultrasound, a technician will spread a warm gel over the lower part of your abdomen and then press a tool called a transducer against your belly to examine your fetus using sound waves.

Earlier ultrasounds are more accurate in terms of predicting the due date, so that's why doctors will usually use the dates and measurements from the first ultrasound of the pregnancy as a reference.

As the pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases.

**The Pregnancy Resource Center offers free ultrasounds to determine how far along you are in your pregnancy and to see if your pregnancy is viable.

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