Ok I've just read that during the first 12 or so weeks of pregnancy you can have what is called a luteum cyst. This remains until the placenta takes over. Since the placenta is what produces hcg, how would you get a positive pregnancy test to detect hcg until about 12 weeks when your placenta then takes over? isn't it possible that you could be pregnant with negative test results, be it blood or urine before the placenta takes over the luteum cyst's function since the placenta is what produces the hcg?