I am 35 years old this October. I have had to have 2 abortions for tubal pregnancies and a miscarriage. I had an auto accident 11/10 which caused herniated disc and nerve damage in neck. My doctor put me on some progesterone, because I am not pregnant. It started my period after 8 months. I have had 1 internal ultrasound with no results, today i had an external ultrasound after drinking 45 oz. of water to have my bladder full, yet the nurse still couldn't see my uterus or anything else. What could be wrong? I am worried.