If she does get an ultrasound despite a negative pregnancy test, it’s possible a pregnancy won’t show up in the first trimester because of problems such as the way the uterus is shaped, or simply because the medic doesn't spend time looking for it if they don't believe it's there.
A pregnancy test may come back negative even after the woman has missed her period for a number of medical reasons.
There may be signs there, but essentially a cryptic pregnancy is one where these signs are not obvious to the woman, or she denies they are there.
The GP explained that for some women, their uterus may remain tiled backwards for the duration of their pregnancy.
Other factors that could result in an invisible pregnancy could be "previous surgery, endometriosis and other gynaecological conditions [that] could scar the utroseacral ligament".
