If you are worried about missing it I'd test again in about 6-8 hours. I usually get ewcm before I o but I just got a smiley opk and no ewcm yet. So we will see. I also usually get +opks for at least 24 hours so I'm ok with testing once a day.
Good luck! Either way I'd get to bd'ing.
(by the way I usually don't respond if I don't have any advice and I couldn't respond before I had an account just for info)