Menopause , ovarian cancer , pregnancy ???

My mother is 48 and hasn't had a period since april. She is two months late. My mom started at age 12 and thought she was just hitting menopause but her doctor did a test and her hormones are at a normal level. She doesn't have the symptoms of ovarian cancer except she did gain six puonds in the last two months. She feels like she has more symptoms of pregnancy but she had her tubes tied sixteen years ago... I am just afraid my mom might have cancer. She has an appointment for july 12 but if it is cancer waiting that long won't it spread. I am only 18 and I afraid of losing my mom. What should she do... Is it possible she has ovarian cancer??? Help!!!!