OPK vs EWCM

Liana • I`m 32 and trying to get pregnant with baby #2.
I am on CD 12 and have been getting negative OPK's for the past couple of days. When I wiped today, there was a very long glob that looked like EWCM. Should I base my fertility off that or go by my OPK's? I don't usually ovulate until CD 14.