Hi!
I'm not completely certain what your doctor told you, but i suspect he ment that your uterus was tipped backward told your colon rather than tipped forward told your bladder. This doesn't really mean anything, as the pregnancy will "straighten" it out as the baby grows. About 20-30% of women have a uterus which is tipped back toward the colon, so it is nothing to worry about.
Good luck!
Dr B
I dunno about upside down but mine tipped the wrong way 100%. When i did my 1st ultrasound they couldn't see the baby till they did a vaginal ultrasound.
My doctor told me that the weight of the baby would tip my uterus to the right way.