No positive OPK but EWCM

I haven’t been successful with getting a positive opk, maybe because I haven’t been testing properly. Never managed to get a dark enough line, darkest was Sunday but still not enough to be positive I don’t think. I’ve had a small amount of EWCM yesterday (Weds) & this morning. App suggested my date of ovulation was yesterday. Temp spiked this morning. Could I have ovulated yesterday as predicted, despite negative OPKs?