I just bought the digital test strips.

Turns out what I thought were PG symptoms was plain old stress (I recently lost my job). So AF came 2 days late (I am always on time, 27 day cycle, never been on BCP) So now I have no idea when the heck I will O because my cycle is messed up.

What CD do I start using the test strips?

PS- I bought the test strips online so I don't have the directions yet. Just wondering who else has used these.