Hey,
Positive pregnancy tests don't always indicate that conception has occurred. In some instances, false positives occur completely unrelated to pregnancy. Several medical conditions can cause the production of human chorionic gonadotropin, or HCG, the hormone which usually indicates that conception has occurred. Although very low quantities of HCG are present in some cases, the advanced technology of home pregnancy tests allows for detection of HCG at lower levels. Many doctors verify pregnancy by drawing multiple blood samples over the course of days or weeks and follow up with an early ultrasound at around six weeks gestation.
Pituitary Disorders of the pituitary gland can cause a false positive pregnancy test. Pituitary tumors can stimulate cells in the pituitary gland to produce HCG. Menopause can also affect the pituitary, leading to HCG production and false positive pregnancy tests. On rare occasions, the pituitary can create HCG even when no disorder or tumor is present.
Ovarian Cysts, Corpus luteum cysts on the ovaries can cause false positives on pregnancy tests. The corpus luteum remains on the ovary after the egg is released. With time, it disintegrates and the cycle is repeated. If the corpus luteum fills with blood or fluid, it becomes a cyst and remains on the ovary. The corpus luteum produces HCG, and can therefore interfere with the accuracy of a pregnancy test.
Chemical pregnancys, Less than 5 is classed as none pregnant. If you have hcg of above 5 a retest for hcg would be recommended. If you had a hc beta of 10 and then have negative hpts. It was more than likely that you had a biochemical pg. If your hcg level is still 10 and still having faint bfp hpts, further tests should be done especially a ultrasound scan.
Good luck.