What is meant by very mobile uterus moving anteverted and retroverted. endocardium thick 9mm @ cd3. no pelvic free fluid. does is mean early preg?

Normal: It is OK to have a mobile uterus or a very mobile uterus, does not mean good or bad. It is unusual to have a 9mm thick endometrium on cycle day 3, so depending upon what symptoms prompted the ultrasound, further follow up may be necessary. This is itself does not mean pregnancy, certainly doing a pregnancy test may help resolve the situation.