Problems weakness, back-pain, nausea
following a reduced menstural cycle, urine pregnancy
Information needed--- a) any spotting / discharge per vaginum ?
b) Any urinary symptoms like burning, desire to pass urine frequently
c) any episode of acute pain in the lower abdomen, any episode of back pain
before this episode?
probability of a pregnancy can be ruled out by doing a Beta hcg blood test
and a USG pelvis. Usually this would be accompanied with a bloody discharge pv/ spotting pv.
A Pelvic inflammation could be another cause, which can be ruled out by an internal examination,
Lastly a urinay infection could cause these symptoms.
with best wishes