Pale yellow cervical mucus ????

So i read online that a early sign of pregnancy is a pale yellow cervical mucus. My question is how many time does that discharge happen when it’s early on a pregnancy. Can it show up just once then you have normal white discharge or it can happen once or twice or back to back with the pale yellow discharge?

I’m doing a essay on cervical mucus, so it would be kind if you help if you want thank you