Note that certain prescribed medicines, designed to provoke ovulation might contain hCG hormone and give you a "false positive" result in pregnancy tests. So if you take fertility medication, ask your doctor if they contain hCG. The most known medication, Clomid, does not contain this hormone though. 

hCG is the hormone secreted from the placenta right after the implantation of the fertilized egg in the womb. This hormone is the perfect proof of pregnancy. But it is not secreted just to inform you on your pregnancy. It also gives to the corpus luteum the command to maintain the production of Progesterone. Progesterone warms up the body and when its levels are high, period doesn't come. This is why a pregnant woman has a slightly high temperature. The presence of hCG also ensures that progesterone will continue to get secreted so that the endometrium is intact. 

Pregnancy test by detects hCG in urine 9-10 after the implantation of the fertilized egg in the womb (a few days before the expected period). At this time the result line will be very faint. Note that this period may vary, as the time of conception plays a very important role. 


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