the answer is "sometimes". it really depends on the skill of the person doing and reading the ultrasound as well as corresponding blood tests (like a very sensitive pregnancy test that detects levels of hcg).
can you tell if an ectopic pregnancy has ruptured via ultrasound? . if your doctor suspects an ectopic pregnancy and orders an ultrasound is there a way to determine if the tube has ruptured from looking at the ultrasound results?