First Response™

Understanding Ovulation & Your Best 2 Days to Conceive


How Ovulation Tests Work
Ovulation tests help you identify the two days of the month when you're most likely to get pregnant.

There are changes in your body right before an egg is released from the ovary (ovulation). Ovulation tests work by detecting one of these changes, specifically the increase of luteinizing hormone (LH) levels in urine. The LH surge, as it is commonly called, precedes ovulation by 24 to 36 hours. Predicting your LH surge with an ovulation test enables you to identify the most fertile time of your cycle — the two days beginning with your surge. The FIRST RESPONSE™ Ovulation plus Pregnancy Test and FIRST RESPONSE™ Daily Ovulation Test are over 99% accurate (in laboratory testing) in detecting your LH surge.

You can maximize your chances of becoming pregnant if you have intercourse within 24 to 36 hours after detecting your LH surge. Timing is one of the most important factors when you're trying to get pregnant.

For extensive information and support for those trying to conceive, visit

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