Cervical Mucus is a vital substance produced by glands in your cervix. 
 
 
  • It's actually a mixture of secretions from different types of glands in the cervix - whatever is secreted mixes together and sits at the junction of the lower end of the cervix and the vagina.
 
  • Some mucus moves down the vagina to the outside world which is why you'll notice in your underware or on loo paper.
 
  • Cervical Mucus changes throughout your cycle - you'll be able to differentiate between fertile and infertile forms.