No, your luteal phase will vary month to month, generally only by a day either way, but it will change, so you're ok. I think you did O on the 14th (I'm no where near an expert though), so you may (or hopefully may not!) get AF some time today.
Btw, if you aren't getting EWCM and only ever get creamy, you should try taking Robitussin to help thin your CM. The spermies only survive in fertile CM which is thinner, so that might help out a bunch! Keep us posted as to what goes on and hopefully someone else will be able to help more.