When you ovulate, you secrete the hormone LH in your urine. An ovulation test measures the concentration of LH, so when your ovulation test becomes positive, it means that the concentration of LH has increased significantly and that you will ovulate within the next 24-36 hours. 

An ovulation test therefore helps to increase your chances of pregnancy, as it is only in the days leading up to ovulation and during ovulation itself that you can become pregnant. Read much more about ovulation here:  Positive ovulation test: What are the chances of getting pregnant? – Gravidtid

The chances of pregnancy 

Rigshospitalet has investigated the chances of pregnancy during a cycle in women in different age groups. 

If the woman is 20 years old, then her monthly chance of pregnancy resulting in the birth of a baby is 34%. If the woman is 25 years old, the chance is 24%. When she is 30, the chances are 17%. A 35-year-old woman's monthly chance of pregnancy resulting in the birth of a baby is 12%. By the time she turns 40, the average chance is 6% 

Positive ovulation test – sex when? 

The research shows that sperm normally live in the uterus and fallopian tubes for 2-3 days but can live therefor up to 7 days. This means that even if you have intercourse up to 7 days before the release of the egg, a sperm can fertilize the egg. Some of the sperm can, however, manage to pass during the days, and therefore the chance of pregnancy is greatest if you have sex 1-2 days before ovulation and up to 24 hours after ovulation. If you have sex 2-3 times a week, then you can almost be sure to hit ovulation and then cross your fingers that the sperm fertilizes the egg. 

See our large selection of ovulation tests here: Ægløsningstests – Gravidtid