Line on opk

[ss241]

Hey all, I'm 4 days late according to my Ovia app! But I think I didn't ovulate until
Later in cycle?? Like 4 days before period due??
I've have kept doing opk and definitely has positive for last weekend which then the line for fainter/non existent but today there is a line again?

You wont ovulate 4 days before your period is due. Its always roughly 14 days before your period is due

You also get positive OPKs pre period because of the similarity of the structure of the hormone molecules

Thanks.
Yeah I know I'm usually in tww. Cycle must b all over this month! When our data in Ovia was expecting it to recalculate!