OPKs always drove me nuts. They either never gave me a positive, or I got multiple days of positives 7+ the once cycle before I stopped using them. They simply not work for every woman.
As far as the lack of EWCM, just the wet feeling will also work too. Just like with the OPKs, not every woman gets the EWCM. Other the pre-seed, there are some other tips you can possibly try to. Drink lots & lots of fluids, avoid allergy meds that have a decongestant in it. The decongestant will dry everything up, even down there. Mucinex or Robitussen (or generic version)that only contains the drug guaifenesin (an expectorant) will also increase fertile CM for some ladies. I've also heard eating baby carrots, adding B6 vitamin to the mix. There's a slew of other stuff out there too, I personally was leery of adding herbal things since they can interfere with other medication you may be on, and my body reacts strongly to meds in general. A regular strength tylenol will knock me out. But other ladies here on JM have used them with success. I increased my fluids (figured it was good practice anyway as they want you to drink lots of water when pg anyway), stopped my allergy meds, and I tried the Robitussin. Both of those did increase my fertile CM. Once we knew we had to go the IUI route, I stopped the Robitussin as it wasn't needed for me anymore.
Good luck!!! I hope you did manage to catch the O this cycle!!! And yay for not dealing with AF for Christmas now.

Me on the other hand, expect her around the 21st/22nd since I'm pretty sure I O'd on the 11th. Boo for me.