Opk question after a miscarriage

Melinda • Had 4 miscarriages in 2015 and had our rainbow baby December 2016
When should I start using opk again after a miscarriage? Dr gave us the ok to start trying right away since it was pretty much a chemical and no complications. I just miscarried last week (Tuesday and Wednesday). Should I wait or should I start now using them? I don't want to get an inaccurate reading.