First day of my last period. See your timeline. Sources BabyCenter's editorial team is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world. Methods for Estimating the Due date. American College of Obstetricians and Gynecologists. Committee Opinion. May Reaffirmed Featured video. Chinese Gender Predictor. Pregnancy Week by Week. Most popular baby names of Pregnancy Weight Gain Calculator.
Baby Names Finder. Sex during pregnancy. New to BabyCenter? The advanced method uses the Mittendorf-Williams rule, which is said to be more accurate since it takes more factors into account like race, weight and coffee consumption.
First day of last menstrual period. January February March April May June July August September October November December 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Use conception date instead?
Average Length of Cycle 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 days default Average Luteal Phase Length 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 days default Race Caucasian Non-Caucasian. Pre-pregnancy height ft in cm switch to metric. Pre-pregnancy weight lbs kg. Higher education No Yes.
Most pregnancies last around 40 weeks or 38 weeks from conception , so typically the best way to estimate your due date is to count 40 weeks, or days, from the first day of your last menstrual period LMP. Another way to do it is to subtract three months from the first day of your last period and add seven days. So if your last period started on April 11, you'd count back three months to January 11 and then add seven days, which means your due date would be January Calculating your due date based on the first day of your last period works well for women who have a relatively regular menstrual cycle.
But if your cycle is irregular, the LMP method may not work for you. Because a reliable estimated date of delivery EDD is important, you and your practitioner can use your conception date instead if you remember it. Just add days to get your estimated due date. There are more than , assisted reproductive technology cycles performed each year in the United States, resulting in about 77, or more babies born a year, according to the Centers for Disease Control and Prevention CDC.
If you are part of the growing tribe of in vitro fertilization IVF moms, you can calculate your due date more precisely using your IVF transfer date.
An early ultrasound, which can more accurately date the pregnancy. Just be aware, however, that not all women get an early ultrasound. PMID 8. Ultrasonography in Pregnancy. American College of Obstetricians and Gynecologists. Conceptional age, menstrual age, and ultrasound age: a second-trimester comparison of pregnancies of known conception date with pregnancies dated from the last menstrual period.
PMID: Trauma in pregnancy. Emerg Med Clin North Am. Hay DL, Lopata A. Chorionic gonadotropin secretion by human embryos in vitro.
J Clin Endocrinol Metab. Wilcox AJ, et al. Time of implantation of the conceptus and loss of pregnancy. N Engl J Med. Lohstroh P, et al. Daily immunoactive and bioactive human chorionic gonadotropin profiles in periimplantation urine samples. Biol Reprod. Cervical insufficiency. The American College of Obstetricians and Gynecologists. Berghella V, et al. Ultrasound Obstet Gynecol ; ACOG practice bulletin.
Prevention of Rh D alloimmunization. Number 4, May replaces educational bulletin Number , October Clinical management guidelines for obstetrician-gynecologists. American College of Obstetrics and Gynecology. Int J Gynaecol Obstet.
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