The symptoms that you describe are unlikely to be due to pregnancy
. However in order to be sure, you should get an ultrasound
of the abdomen done as the urine test maybe falsely negative. It would have helped had you given some more details about the cancer, what stage was it, when did you have it, what surgery did you have, etc. I dont want you to worry unnecessarily, but it is possible that you may have a recurrence of the disease and that can explain all the symptoms. Even that will become evident on the ultrasound.