Back to ttc...advice appreciated...

Hi ladies,
Just got the all clear from my ob at my post-op follow up after my D&C. 
She said we're good to start trying again as soon as I feel emotionally and physically ready. 
I want to start pretty much straight away! She reckons I'll get my first period in a couple of weeks...
When should I start using my opk's? Is it worth using some now? 
Thank you!