How do you collect cervical mucus?

I stick a finger inside and I manage to get some but barely anything, and this is in all points in my cycle. I'm not infertile as I have been pregnant before but do I just not know how to do it or do I just not make that much? I see pictures of people with a huge glob in their fingers. For me it's just like little tiny globs of white if it's creamy and if it's egg whites my finger will be damp and sticky. 

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