I need to get bloodwork done but i'm not sure when...
My dr. said to get it done a week after I ovulate. However i don't know when i ovulate

The ultrasound tech told me to get it done a week after my LH surge. So which should i do? What ones sounds right?
Also I had an LH surge a week ago tomorrow but it got darker the next day. Should i go off the day it started to get darker?
I called my DR. office today but no one got back to me

If i am getting it done a week after my surge then i would go in tomorrow. So i kinda need to know asap!!
Thanks ladies