Birth Control Forum - Estimating pregnancy dates by ultrasound and LPD

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Q: Estimating pregnancy dates by ultrasound and LPD

asked by: DoctorQuestion on August 18th, 2008

I STARTED THE PILLS IN THE BEGGINING OF JANUARY AND STOPPED THEM AROUND MARCH 27TH-29TH BETWEENT THEM DAY'S.I WAS SUPPOSE TO START A NEW PACK THAT SUNDAY BUT HAD NO MONEY TO PAY FOR THE PILLS SO I JUST DID NOT TAKE THEM. ME AND MY X HAD SEX THE 17TH OR 18TH OF MARCH BUT I WAS STILL TAKING THE PILLS.ME AND MY BOY FRIEND HAD SEX THE 24TH OF MARCH. THEN WE ALSO HAD SEX THE 31'ST OF MARCH. I WAS OFF THE PILLS FOR ABOUT 3-4 DAYS WHEN WE HAD SEX ON THE 31'ST. I WENT TO GET AN ULTRASOUND JULY 16TH AND I WAS TOLD I WAS 16 WKS AND 2 DAYS. I WENT 3 DAYS LATER BECAUSE I HAD GOTTEN HURT AND WANTED TO MAKE SURE THE BABY WAS OK..THE MIDWIFE CHECKED THE PLACENTA AND SHE MEASURED THE PLACENTA AND SAID I WAS ABOUT 18WKS...SO WHICH WOOD BE RITE? THANKS FOR THE REPLY.I WAS ON LOESTRIN24

Replies(1)

Dr. Nikola Gjuzelov , MD

replied on August 19th, 2008

Birth Control Answer A4572

According to the last menstruation date (15th March), you were 17 weeks and 5 days pregnant on the 16th of July. Three (3) days later on the 19th of July you were 18 weeks and 1 day pregnant.

Ultrasound apparatus doesn't estimate the pregnancy age according to the last period date (LPD) but according to certain fetal dimensions compared with standard values. The difference between a pregnancy age calculated according to the LPD and a pregnancy age calculated by the ultrasound apparatus should not be greater than 2 weeks. In your case, the difference was 1 week and 3 days on the 16th of July. If the difference is greater than 2 weeks then either your LPD was wrong or the fetus is not developing properly.

You may want to consult your gynecologist about this.

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