So much misinformation on this thread and an absolutely enormous drip feed from the OP about her hysterectomy!
Abdominal pain in women of a child bearing age has various differential diagnoses and one of them is ectopic pregnancy. This can be ruled out by a negative pregnancy test.
If the OP really feels that the delay to image her risked her life (abdominal X-rays have very low diagnostic value so I can't imagine that to be the case) then she needs to go to PALS and ask them to investigate.
There is national guidance about offering pregnancy testing to all biological females >12 pre-procedure under GA. This is because a general anaesthetic while pregnant poses additional risks to the mother (and is why elective surgery is generally postponed), the risk of miscarriage and risks to the fetus from potential teratogenicity. In my institution however a hysterectomy would exclude you from this requirement.
I work primarily in paediatrics. We turn up an unexpected positive pregnancy test in our elective surgical population a few times a year. People lie about their risks of pregnancy.
I've also recently dealt with a complaint about a transgender teen who had had no surgery/ hormone treatment who objected to being asked to have a pregnancy test but there is good data that actually transgender teens are more likely to have an unwanted teen pregnancy than their peers. It is thought that barriers to seeking contraception may play a part - if you are presenting as male it makes it harder to say actually I'm having penis in vagina sex and am at risk of getting pregnant so I need to take the OCP.
If people can't produce urine to take a pregnancy test or decline it then I take a a very careful history about why they think they might not be pregnant. Those questions might be uncomfortable/ embarrassing but they prevent me and my institution from getting sued. We are also working on having rapid near patient blood pregnancy tests ( a lab one takes hours to come back) but are having problems getting the tests institutional approval.
The national guidance for ruling out pregnancy prior to radiation exposure are different - I think it is a series of questions that need to be asked but I don't know all the ins and outs of it as my expertise is with patients undergoing anaesthesia.