When i first started taking my prenatal vitamins my urine was neon yellow, now i'm 7 months pregnant and when i take them, urine looks normal. why?

Using more vitamins: Generally vitamins b1 ; b2 turn urine yellow. Taking more than you need is harmless ; your body excretes the unused vitamins in your urine, turning it yellow. Your body is probably using more vitamins at this point in your pregnancy so you have less unused vitamins excreted in your urine. I don't know how much b's are in your prenatal- some have just the rdi ; you may benefit from higher doses.