For the most accurate determination of the gestational age, it is useful to know the date of conception. This will help to correctly observe the development of the fetus and predict the date of the upcoming birth as accurately as possible.
Instructions
Step 1
Determine the length of your menstrual cycle. To do this, count the number of days that have passed from the first day of the penultimate month to the beginning of the last. If you keep a calendar of critical days and know the dates of several periods, calculate the length of these cycles and find their average duration. This figure will be more accurate.
Step 2
Calculate the onset of ovulation. It usually occurs in the middle of the menstrual cycle. So, if critical days are repeated every 28 days, ovulation is most likely to occur on the 14th. It is on this day that conception occurs. Remember that normal ovulation can occur 3 days earlier or later than the expected date.
Step 3
Think back to when you had intercourse as close as possible to your calculated ovulation date. Since sperm live an average of 3 days, fertilization can occur a few days after intimacy. Traditionally, fertile is the week from the 11th to the 17th day of the menstrual cycle. These days the probability of conception is maximum. But there are also exceptions. A feature of the body of some women may be ovulation, which does not occur in the middle of the cycle. Also, the period favorable for conception can move in time due to the intake of hormonal drugs, climate change, stress, physical fatigue.
Step 4
Consult a doctor or have an ultrasound scan. An experienced doctor will accurately determine the week of pregnancy during the examination. Ultrasound screening can also show how long the fetus is developing. Based on the data obtained and comparing them with the dates of sexual intercourse and expected ovulation, you will determine the date of conception with maximum accuracy.
