positive opk but 3 days later still loads of ewcm i am so confused..

So saturday (16 Sept) i took a opk wich came back positive.. so me and my husband had sex on saturday and friday night.. when would ovulation have occurd beacose today and yesterday i am having a really big amount of ewcm .. i cant really say that i had that my last cycle.. atleast not so long and so much... i am feeling a little crampy.. so if i actually ovulate today then i missed my chance ?