Calculations based on the duration of your menstrual cycle might help you pinpoint the day you conceived. A regular menstrual cycle takes a woman 28 days to complete. To begin, record the date of the first day of your last menstruation before becoming pregnant. Then, count back from that date to find the first day of your next period. This is the date you are expecting, provided that you were not pregnant at the beginning of your break between periods.
It's also possible to estimate the date of conception from the first day of your last normal menses until the estimated date of delivery - about 39 weeks from the first day of your last period. Then, add seven months for a more accurate prediction of birthdate. This method is called the LMP (last menstrual period) method. It's the most reliable way to determine gestational age with accuracy. However, it requires that you record the date of your last period and its type (menstrual or non-menstrual), which can be difficult if you're not sure when your period ended or if you have irregular cycles.
A doctor can also do an ultrasound to establish a due date. This is usually done around week 18 of pregnancy because at that point you can see embryonic heart activity on an ultrasound image. A nurse or other health professional will guide you through the procedure while you lie on a bed or chair.
For women who have a normal menstrual cycle, conception generally occurs between the 11th and 21st day since the beginning day of the previous period. Because most women are unaware of the date of ovulation, the conception date is merely guessed in this manner. The accuracy of this method can be improved by using special ovulation tests such as basal body temperature or urine pregnancy tests.
For women who have regular periods but also experience bleeding during their menstrual period (Menorrhagia), they may assume it is their last period before getting pregnant. However, this assumption is not accurate because infertility can occur even if a woman has had regular periods her entire life. Infertility can also arise after a single episode of vaginal bleeding during menstruation (Metrorrhagia). This shows that although menorrhagia and metrorrhagia are common symptoms of pregnancy, they do not guarantee that a woman is actually pregnant.
Women who know they are pregnant should not eat spicy foods or drink alcohol, as these substances could cause miscarriage. Spicy foods may also cause pain and inflammation during pregnancy, so it's best to avoid them until you know how you will manage this change in your diet.
Spontaneous abortions are usually due to medical causes such as infection or hormonal problems. But sometimes they are due to non-medical reasons such as emotional stress, smoking, or drinking alcohol.
This is why doctors base a pregnancy on the date of your last menstrual cycle. They do this for consistency, and if you really want to know when you conceived, you may guess two weeks after your previous period. A typical menstrual cycle might last anywhere from 26 to 35 days. Several things happen at this time:
Calculate Your Pregnancy Due Date How is my due date determined? Adding 280 days (40 weeks) to the beginning day of your last menstrual period yields your due date (assuming a 28-day cycle). It is important to note that your menstrual cycle and ovulation are counted as the first two weeks of pregnancy.
The procedures described above are accurate within one to five days, but pinpointing the precise day is difficult. This is why doctors base a pregnancy on the date of your last menstrual cycle. They do this for consistency, and if you really want to know when you conceived, you may guess two weeks after your previous period.
The first step in determining your conception date is to identify when you last ovulated. Women can conceive only after they have ovulated, or when their ovaries release a fresh egg into their fallopian tubes for fertilization. Ovulation normally happens two weeks following your menstrual cycle. However, this may vary from woman to woman -- sometimes it's earlier, sometimes later.
Your ovary produces estrogen and progesterone during each menstrual cycle. Estrogen levels are high before menstruation and low after menstruation. Progesterone levels are also high just prior to menstruation and lower during menstruation and aftermenstruation. The point at which estrogen and progesterone are released into the bloodstream at relatively equal amounts is called "the mid-luteal phase." During this phase, women are most likely to get pregnant because the walls of their uterus become receptive to sperm. If you miss your chance then, it'll be gone forever until you get yourself another period.
Ovulation doesn't happen exactly at the beginning of your menstrual cycle but rather several days before then. So, to find out your conception date you need to figure out how long ago you last ovulated. Only then can you estimate how many periods have passed since that moment in time.
The first day of your most recent menstruation The most popular method for calculating your due date is to count 40 weeks from the beginning day of your last menstrual cycle (LMP). That is how the majority of healthcare providers operate. However, some women don't experience their period after the 39th week of gestation (a condition called post-menopausal bleeding), and others find this method confusing or inaccurate. So there are several other methods used by health care professionals to estimate the due date.
You can calculate your due date yourself using one of these methods:
Take your last normal menstrual period (LMN): Count back from the date of the LMN until what would have been the first day of your next period, then add seven days to that number. For example, if your LMN was March 2nd and you count back forty weeks you get January 4th. Add seven days to get January 11th as your due date.
Use what's called a "gestational age" instead: This method assumes that you started growing babies at the same time and that gestation is equal to forty two weeks for every month that you've been pregnant. So if you think about it in terms of months, it's like saying that your baby is due on the 1st of February even though it might not come until the 1st of April!