I would pay more attention to what your body is doing than to an OPK - have never had a positive OPK myself.

If there is EWCM it is most likely you are fertile, or about to O. Once you have O'd, the EWCM usually dries up (though some people, myself included) have noticed EWCM after O day.

FTR, my DD was conceived without charting, OPKs or anything - DH & I just BDd when I had fertile CM.