What does it mean when they tell u there arent enough cells in your uterus after a pap?

Most likely... The most likely answer is that you just need to have the pap repeated. When your doctor got the sample, not enough cells may have transferred from your cervix to the brush for the lab to look at. Having the pap repeated usually resolves the issue.
Unclear. What was probably meant was that when they took the sample from your cervix for the pap smear, that not enough cells were seen to make a reading one way or another. Sometimes this happens and the pap is repeated.