text: can a tumor in the uterus be mistaken for a pregnancy? i am told i am 9 weeks pregnant but yet the home made pregnancy reveals a no answer what could possibly be wrong with me? ....if you already know your pregnant, then why are you taking more tests? and i highly doubt it because if your pregnant, those tests are suppose to pick up hormonal (sp?) changes in the body, tumors dont change hormones that i know of...sorry if im wrong.