Using an IVF calculator to calculate your due date is slightly different than calculating your due date for a natural conception. Because the exact date of embryo transfer is known, the due date calculation is more precise. Below, we’ll explore the basics about due dates, as well as how to use an IVF calculator to determine your due date.
Due Date Basics
Due dates are calculated based on the average gestational age at birth, which is about 40 weeks from the woman’s last menstrual period. However, a due date is only an estimate: babies can be born healthy within a range of about a month. Normal term gestation is generally defined as 37-42 weeks, and a baby may be born any time during that period. Only about 10% of women actually give birth on their due dates. The due date is just an estimate – not a requirement.
About IVF Due Date Calculations
Natural conceptions are calculated based on the first day of the woman’s last menstrual period, and the gestational age is calculated from that time as well. Ovulation and conception occur 14 days after the start of the menstrual cycle on average. For example, if the last menstrual period was May 1 and it is now June 1, the baby was probably conceived around May 14, the gestational age will be 4 weeks, and the due date will be February 4 of the following year.
Calculations for natural conception are not necessarily very precise because of several factors. First, if the pregnancy was unexpected, the woman may not remember the date of her last menstrual period. In addition, menstrual cycle lengths vary, meaning that some women ovulate before or after the average ovulation date. During early pregnancy, growth occurs at a very standardized rate, meaning that it is often possible to use ultrasound growth measurements to confirm or change the due date if there are significant doubts as to the true gestational age.
With IVF, it’s possible to be more precise. An IVF calculator can calculate your due date based on whichever date you’re more certain on: the first day of the last menstrual period, the day of ovulation, egg retrieval, or insemination, the date of the 3-day embryo transfer, or the date of the 5-day embryo transfer. For example, if the 3 day embryo transfer occurred on May 1 and the date is now June 1, the gestational age is approximately 6 weeks and the due date is January 19 of the following year.
To calculate your due date from a potential IVF cycle or your current pregnancy, you can use IVF Connections’ IVF Calculator. For a calculator that provides more detailed information such as due dates for multiples, trimester dates, and prenatal testing dates, you can use FertilityFriends’ IVF Calculator. An IVF calculator is useful for calculating a due date after intrauterine insemination (IUI) as well as IVF.
IVF may produce particular concerns about the due date. For example, multiple pregnancies are much more common with IVF and other advanced reproductive technologies than with natural conception. On average, twins are born about 3 weeks before single pregnancies (37 weeks gestation), while triplets are born at 33 weeks on average, and quadruplets are born at an average of 31 weeks gestation. Multiple pregnancies come with an increased risk of certain complications, especially preterm labor.
IVF has a much better chance of producing pregnancy than does natural conception, especially for couples who are struggling with infertility problems. However, as with natural conception, there are no guarantees of getting pregnant on the first try. In fact, most couples don’t get pregnant after the first IVF cycle, but the majority do get pregnant within 3 cycles. For that reason, it’s a good idea to plan on going through at least 3 IVF cycles before considering other options.
After IVF, IUI, or other fertility treatments, you will have to wait some time before finding out whether or not you were pregnant. Usually, it’s possible to confirm a pregnancy 2 weeks after the embryo transfer or insemination, using a urine test or a blood test. After all the hustle and bustle involved in the IVF process, this 2 week wait can be a frustrating, exciting time.
If you’re interested in in vitro fertilization or other fertility treatments, please schedule a consultation with Advanced Fertility Services. To schedule your consultation today, please give us a call at (212) 369-8700 or click below and we will get right back to you.