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False positive rarely happens, because very few factors can cause the test strip a false positive reading. If you are using fertility drugs (not including clomid), a false positive could happen. Another reason may be caused by reading the result out of the timeframe specified by the manufacturer, which is normally after five or ten minutes. Hardly anything (besides fertility drugs) can interfere with a pregnancy test result, so a true false positive is not a common occurrence.
On the other hand, false negative result is more likely to happen due to the hCG production, rate of hCG level increase, mentioned in last two questions. If you do want to test early, do not panic if you get a positive result. Follow-up tests are recommended to account for various factors that may postpone or delay your first positive result. These factors include date of implantation, concentration of hCG in a given urine sample (First urine in the morning or urine held an extended time duration increases concentration of hCG) , specific rate of hCG increase (depends, in some cases, on where in the womb the fetus implants).
Finally, a chemical pregnancy is a not entirely unusual phenomenon which is normally related to trying-to-conceive (TTC) women. That's because trying-to-conceive couples will be testing, on average, sooner. A chemical pregnancy happens when a fertilized embryo implants briefly in the uterus (long enough to produce the hormone hCG) but the pregnancy does not actually happen, and is followed by normal menstruation. Hence, in such a particular situation, you can get a positive result and, several days later, find yourself quite surprised and disappointed with a series of negative results. A chemical pregnancy is not a rare phenomenon, and thus it is one of the emotional hazards of early-detection tests.
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