If you have trouble using an OPK, you can ask your doctor to run some blood tests to help you pinpoint your ovulation | They can recommend a fertility specialist or treatment and testing options |
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You may need to have a few blood tests to determine your fertile period | But once a developing egg follicle reaches a certain size — usually around the midpoint of your cycle — LH secretion surges to really high levels |
Your LH surge is important because it initiates the beginning of ovulation and your fertile period.
22Some doctors may also recommend a | LH is one of the hormones produced by the pituitary gland |
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Ovulation usually occurs about 14 days before your period |
The tests can be expensive to use that frequently.
8Progesterone is a hormone needed to support a potential pregnancy | It signals the beginning of your fertile period |
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After that, your fertile window is over | You should get a positive result on an OPK a day or two before that, on day 16 or 17 |
There are several disadvantages to using an OPK, including the following:• Ovulation most likely occurs around day 18.
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