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Doctor insights on: Pregnancy Calculater

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Is ultra sound calculate in gestation age or fetal age?

Is ultra sound calculate in gestation age or fetal age?

Gestational age.: By convention, all ultrasound measurements refer to gestational - not embryonic age. Take Folic Acid 1-5 mg daily and good luck! ...Read more

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

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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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

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When is pregnancy calculated first day of last period or conception because my LMP is 9-8 40 weeks from that would give me a due date of 6/15?

When is pregnancy calculated first day of last period or conception because my LMP is 9-8 40 weeks from that would give me a due date of 6/15?

40 weeks from LMP: 40 complete weeks from the first day of the last normal mentrual period. With uncertain lmp, dating is by ultrasound, but if within 1 week to lmp, then menstrual dating is still used. Obstetrical dating is never based on conception, even with ivf pregnancies. ...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 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 to calculate pregnancy week. Last LMP start date 14th april 2013.

Variable: Based on lmp 4/14/13 the pregnancy is currently 5weeks and 5 days. This contains built in error of about two weeks however. ...Read more

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I'm 4 or 5 days late for my period, I took a pregnany test this morning it was negative I've calculated to be about 19 maybe 18 days past conception?

I'm 4 or 5 days late for my period, I took a pregnany test this morning it was negative I've calculated to be about 19 maybe 18 days past conception?

Maybe not pregnant: Can retest in 4-5 days. A urine pregnancy test done correctly will give a reliable result 3 weeks after sex (or when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and therefore lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant. ...Read more

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How does a doctor calculate pregnancy when I have a 25 day cycle?

How does a doctor calculate pregnancy when I have a 25 day cycle?

First day of last pe: If your cycles are regular, and coming every 25 days, then using the first day of your last menstrual cycle would be customary. Also, an ultrasound performed in the first 12 weeks of pregnancy is accurate to +/- 1 day, so this is a very accurate method of determining your due date as well. ...Read more