Re: positive blood test for preg is 100% OR not.
Sometimes a Corpus Luteum (filled with blood or fluid) can form a Cyst & is mistaken by pregnancy too and it shows false positive pregnancy test. This Cyst disintegrate by the time too or sometimes it starts growing and is mistaken for a Pregnancy. Because the corpus luteum contains hCG, it is possible that a pregnancy test will detect the presence of this hormone as being positive for pregnancy. Might be your cousin faced it and the cyst brokedown by its own and is now disappeared from her body.
Wish her best of luck for her future Pregnancy ![]()