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Doctor insights on: How To Calculate How Many Weeks Pregnant You Are

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How do they calculate how many weeks pregnant you are in an ultrasound?

How do they calculate how many weeks pregnant you are in an ultrasound?

Measurements: During an ultrasound of a pregnant woman various measurements are done including the diameter of the baby's head, the circumference of the head and belly, and the length of arm and leg bones. How many weeks the baby is can be determined by those measurements. The earlier an ultrasound is the more accurate it is. ...Read more

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Dr. Neigatha Graney
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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I am 25 weeks ptegnant. So how many months am i.. I calculate 6 months and 1 week. But i don't know if un rite or what?

I am 25 weeks ptegnant. So how many months am i.. I calculate 6 months and 1 week. But i don't know if un rite or what?

Weeks better : It is better to talk about your pregnancy in terms of weeks instead of months. 40 weeks is your due date. If you prefer to talk about months then divide your number of weeks by four. And remember that you have to finish the 9th month to get to your due date. ...Read more

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How is the pregnancy due date calculated?

How is the pregnancy due date calculated?

40 weeks from LMP: The convention is calculating 40 complete weeks from the last normal mentrual period. For assisted conception by any method there are small modifications, but they don't change the basic rule. With uncertain/unknown lmp, dating is estimated by ultrasound measurement of fetal parts and pregnancy structures, but if this agrees within 1 week to lmp, then menstrual dating is still used. ...Read more

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How many weeks and days am i with a edd of nov. 30th? How is pregnancy calculated? When did i get pregnant?

Match 9 : Based on the due date you gave conception occurred on march the 9th give or take a few days. Pregnancy is calculated by your last menstrual cycle or by a sonogram. You'll have to ask your specific doctor how yours was calculated. You are 27 weeks and one day today. ...Read more

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How are the weeks of pregnancy calculated when your cycle days range from 34 to 36 days? When should u take a hpt?

How are the weeks of pregnancy calculated when your cycle days range from 34 to 36 days? When should u take a hpt?

After missed period: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about 2-3 weeks for the embryo to make enough HCG to produce a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully. If you do not wish to be pregnant, use contraception all the time, every time. You may consider implanted contraceptive, or IUD. Practice safe sex. ...Read more

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I am confused about how the weeks of pregnancy are calculated. If conception occurs in week 3 of pregnancy, how could week 4 be 2 weeks post-conception? How are the weeks of pregnancy typically determined?

I am confused about how the weeks of pregnancy are calculated. If conception occurs in week 3 of pregnancy, how could week 4 be 2 weeks post-conception? How are the weeks of pregnancy typically determined?

Menstrual Weeks: Usually, the actual date of conception is unknown, therefore pregnancy is dated based on the first day of the last period. The due date is 40 weeks from this date. Sometimes conception date is known (ie ivf pregnancy) in which case the estimated due date is 38 weeks later; for the purposes of calculation ovulation is considered as day 14 of a theoretical cycle. Early sono will confirm dating. ...Read more

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How is week of pregnancy calculated after IVF? Transfer was 10, retrieval 7 of May; MaterniT 21 plus on July 14th. Was I after 10 weeks on JuLy 14th?

How is week of pregnancy calculated after IVF? Transfer was 10, retrieval 7 of May;  MaterniT 21 plus on July 14th. Was I after 10 weeks on JuLy 14th?

IVF dates: If your egg collection was on May 7th, that is how it is calculated. You are currently 22 weeks and 6 days. Yes, you were past 10 weeks on July 14th, you were about 12-13 weeks. ...Read more