Does neon yellow pee mean you are pregnant?

It is not because of pregnancy, but it also doesn't mean you are not pregnant. Your urine can turn neon yellow by taking a B2 vitamin supplement (riboflavin). Many people who are trying to conceive take folic acid supplements in the form of a B-multi. A B-multi probably has B2 in there as well, which will make your urine a bright yellow. It's not bad, and it doesn't mean there's anything wrong with your supplement.