12-16 days before menstruation, ovulation occurs. If the cycle is 28 days, then ovulation will occur most often in the middle of the cycle. After ovulation, approximately 14 days more often pass.
It is possible to become pregnant if sexual intercourse occurred from 3-4 days before ovulation (that is how many sperm live), ending with one day after ovulation (an egg lives so much). However, I would like to note that the method of determining ovulation is not an effective method of contraception, as sometimes ovulation can occur in one cycle two times, or move for a couple of days. But for planning pregnancy, determining ovulation can be very useful.
How to determine ovulation by certain "symptoms"
The so-called "symptoms" of ovulation are subjective, but if a woman is observant, then she will definitely notice changes in the body. So, one of the indicators of ovulation will be an irresistible sexual attraction. And some women have tingling sensations and pulling pains in the lower abdomen.
The nature of the vaginal mucus also changes - its amount increases several times, and by its consistency it becomes more viscous and viscous. An experienced gynecologist will definitely notice the approaching ovulation, since there will be a plentiful accumulation of transparent mucus in the cervix, and between the jaws of the tweezers it will stretch for several centimeters.
How to determine ovulation using measurement
basal temperature
This is the oldest and easiest method for determining ovulation. If the method is used correctly, the information will be high and reliable. Basal temperature is measured using a conventional mercury thermometer. How to determine ovulation by temperature? Every morning after six hours of sleep, without getting out of bed, you need to measure the basal temperature for three cycles, and bring the results into a specific schedule (the horizontal axis shows the days of the cycle, the vertical axis shows the temperature).
The norm is considered to be an increase in temperature by an average of 0.5 degrees in the second half of the cycle, but before the increase, the temperature decreases by 0.5 degrees - this is exactly the days of ovulation.
How to determine ovulation using ultrasound
The most reliable method for determining ovulation is ultrasound monitoring. With the help of ultrasound, all changes that occur with follicles are revealed. A sign of ovulation will be the presence of a dominant follicle (its size should reach 18-20 mm). If the cycle is regular, then the snake is carried out 2-3 days before ovulation, and then after it every other day. And with irregular every 2-3 days from the 10th day of the cycle. It is possible to perform an ultrasound less frequently if the estimated ovulation date is calculated according to the size of the follicle - the dominant one increases at a rate of 2 mm per day.
How to determine ovulation at home
How to determine ovulation at home? Before answering this question, it is advisable to verify the presence of ovulation using any other methods, since a false-positive result is possible.
The test strip determining ovulation is very similar to a pregnancy test. You need to use it the same way: lowering the test in the urine, wait a couple of minutes. One strip - the result is negative, two - positive (ovulation will occur in 1-2 days). The method is based on the level of LH in the urine (a couple of days before ovulation, it jumps significantly).
Based on changes in vaginal mucus and saliva before ovulation, a small amount of saliva is applied to the glass (in the morning, before eating and brushing your teeth) and examined under an ordinary microscope. If the picture is clear and looks like a fern - ovulation is approaching. If on the contrary, the lines are fuzzy, broken, therefore, ovulation is not expected in the near future.
I would like to note that studies of this kind should be carried out comprehensively, only then the results will be accurately reliable.