Abbreviations.....

There needs to be some kind of glossary. Perhaps this post can serve as such?
Co and I being the brilliant English nerds that we are, we have figured out TTC (trying to conceive) and dpo (days past ovulation).
Marcie of lightcomingon was kind enough to explain RE (reproductive endocrinologist).
Here's the two we can't figure out: EWCM and AF. Co said she figured out from context clues what AF probably was; but neither of us could figure out what the abbreviation stood for. Unless it's Aunt Flo. Is that right???

The guessing game is admittedly fun, but we're nerdily open to clarification.

P.S. Now, when I post comments, the adorable cake toppers my sister S. made us now appear as my icon (is that correct terminology? does it give away that I have a lot of friends who use LiveJournal? Oh, well). And the picture is on the blog. Please chime in if you think S. could sell such an item, because I know I am her sister and I love her (and thus she won't believe me), but I think custom cake toppers is a niche and could be in some demand....for het and queer couples....and my sister does live in that only state in our fair union that has finally made it legal....