Sonography report uterus is retroflexed & bulky & normal in shape. thick endometrium (15 mm).a posterior fibroid seen. what does it mean? pregnancy?

Depends: If the ultrasound was done to detect a pregnancy, then this could mean that the pregnancy hormone concentration is too low and the pregnancy too young to be detected on ultrasound. It can also mean that the pregnancy is outside the uterus. Endometrium is thin at the beginning of the cycle and gets thicker until after ovulation. 15 mm is on the high end of what one would expect.