If you have a negative result, you would be wise to consider this a tentative finding," says the FDA, or in other words: you could be early in your pregnancy, too early for your HCG levels to register on the test.

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The results from an ultrasound after 5 -6 weeks gestation are much more accurate than using hCG numbers.An hCG level between 6 and 24 mIU/mL is considered a grey area, and you’ll likely need to be retested to see if your levels rise to confirm a pregnancy.

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The above results clearly show that there needs to be consistency in how manufacturers of pregnancy tests are permitted to describe their testʼs performance, and that certain pregnancy tests currently available may give women misleading results. The primary reason for this was considered to be the difficulty women had, regardless of socioeconomic group, in understanding product instructions and, consequently, in reading the test results correctly 33. If you have an hCG level higher than expected for your stage of pregnancy, it’s possible that you miscalculated when you got pregnant, and you’re further along than you thought. If you aren’t sure when your next period is due, the NHS recommends waiting at least 21 days since you last had unprotected sex before taking a test. Your first-morning urine, which accumulates in the bladder overnight (after more than four hours of continuous sleep), contains the maximum amount of hCG.If this test gives you a ‘Not Pregnant’ result and you still have not had your period, see your doctor.

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Lower- or higher-than-normal levels of the hCG hormone during your pregnancy might not indicate anything unusual.

This highlights that hCG measurement is a more accurate method for dating early pregnancy than LMP, since LMP provides a value in the same week as the true gestational age for just 46% of women, within 1 week for 78% of women and within 2 weeks for 87% of women 29. Four tests (CBD, CBP, PS, P) were all able to detect 25mIU/ml, a result that was consistent with their respective manufacturersʼ claimed sensitivity of 25mIU/ml and ability to test up to 4 days before menstruation is due.