trying to figure out when I conceived! help!?

Ka

okay so my last period was April 11th, but I have weird cycles.

I got a positive opk on may 13th and 14th then it started fading may 15th.

I thought you ovulated when the strip was dark, but this says "ovulation around the corner". how far around the corner from when the fading starts?

I got my bfp on may 25th.

I know exact days dont necessarily matter, but I'm a numbers person.

thanks ladies!!