The exact length of time between the beginning of the LH surge and ovulation varies from woman to woman. If you have a long LH surge, you can ovulate and still continue getting positive ovulation tests for several days after. Most women ovulate 24 hours after the first positive LH test. However, there is substantial variability between and within women.
Ovulation can occur while you are still getting positive ovulation tests. Since the surge can sometimes last for a day or two, testing every day—or even twice a day, once in the morning and once in the afternoon—can help provide context for where in your surge you are. You are most fertile during the 2 — 3 days before ovulation. This means that for many women, the most fertile days occur before the ovulation test even turns positive.
If you always wait for an ovulation test to have sex, you could be missing some of your best days for getting pregnant on your personal fertility calendar. If you know how to track your vaginal discharge —also known as your cervical mucus—you can usually get earlier warning of ovulation than ovulation tests will give you. Some tests require testing with your first morning urine, and other tests require testing with afternoon urine.
The LH surge usually occurs in the morning, but it can take several hours for the hormone to appear in urine. This is why many brands of ovulation tests ask you to test in the afternoon. Another factor to consider is the length of your LH surge. Some women have an LH surge that lasts for a few days, and other women have a surge that lasts only a few hours. Many women find that they can only get a positive ovulation test when they test twice per day, once in the morning and once again in the afternoon.
After the egg is released, the empty follicle on the ovary is converted to a structure known as the corpus luteum. It then begins to secrete progesterone. Progesterone is a hormone needed to support a potential pregnancy. Your LH surge is important because it initiates the beginning of ovulation and your fertile period.
After that, your fertile window is over. This makes it very important to be able to identify this best time to conceive. These are readily available online and in most pharmacies.
These kits are similar to pregnancy tests because they measure hormone levels in your urine. Each kit is a little different in how they register a positive result, so make sure to check the instructions.
A positive result indicates the presence of a high amount of LH, or your LH surge. The tests can be expensive to use that frequently. Ovulation usually occurs about 14 days before your period.
Your LH surge occurs a day or two before that. So knowing how long your cycle is from one period to the next will help you figure out when to start testing. Day one of the cycle is the first day of your period.
Ovulation most likely occurs around day You should get a positive result on an OPK a day or two before that, on day 16 or This is to make sure that you catch the positive result, in case you have a shorter cycle that month. Most experts recommend having sex two to three times over the next 24 to 48 hours. If you have trouble using an OPK, you can ask your doctor to run some blood tests to help you pinpoint your ovulation.
Usually, a gynecologist or reproductive endocrinologist infertility specialist can help you interpret the blood testing results. You may need to have a few blood tests to determine your fertile period.
Some doctors may also recommend a transvaginal ultrasound. This allows your doctor to look at your ovaries and see how the follicles are growing. The length of the LH surge is highly variable from woman to woman. And the actual length of the LH surge does not determine your fertile window. A study in the journal Fertility and Sterility looked at how long the LH surge lasts in normally ovulating women. The image below represents what different LH patterns would look like on daily LH tests from cycle day 11 through cycle day 21 according to the results of the study:.
As you can see from this chart, some LH surges are long, and others are short. In the typical cycle, LH starts out low, then rapidly rises and peaks a day or two before ovulation, then falls back down right after ovulation. But just as not every woman has a textbook day cycle, not every woman has exactly the same LH curve.
The LH surge itself does not have any physical symptoms. But there are signs and symptoms of ovulation that you can track in order to determine when you ovulate.
Most signs of ovulation are driven by the hormone estrogen. Estrogen levels begin to rise roughly 5 days before ovulation. Rising estrogen levels cause your vaginal discharge also known as cervical mucus to increase and become more slippery. This is one of the best indicators that ovulation is approaching. Once estrogen reaches a certain threshold, this triggers the release of LH. This means that you should notice increased fertile vaginal discharge around the time of the LH surge.
But the discharge is a symptom of increased estrogen levels, not LH. Not necessarily. Think of the LH surge as a sign that your body is preparing for ovulation. Ovulation usually will follow the LH surge, but having an LH surge is not a guarantee that ovulation will occur. To confirm that ovulation occurred, you would need to observe an increase in basal body temperature , or have your progesterone levels checked by your doctor.
It can also occasionally happen to women with otherwise normal cycles. In normal menstrual cycles, the ruptured follicle becomes a corpus luteum, which releases progesterone and stimulates the lining of the uterus to build up. But with LUF, even though the follicle never ruptures, it still releases progesterone.
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