So I was wondering if cervical mucus can tell if someone is infertile or not. I ask this because I know that cm has different stages during your cycle. My cm is mostly a thick clearish white color and that's all I have. Sometimes when my period is close or if I'm in my "fertile window" that comes after a period my cm is a watery clearish white. I know that when a woman is fertile that the cm is clear and the texture is kind thin and stretchy. I don't get that. Does that mean that I'm not fertile or that my fertility is low? I asked my mom about it she said that once I'm sexually active my cm will change. But I am sexually atctive. 

So does anyone know what this means? I'd really appreciate the help. I'm too young to be trying for kids but I'd still like to know if I can have them.