I got my first positive opk!

So I was on the pill for 10 years, came off 3 months ago and been trying to figure out my cycle since then. Today I got my first opk!What does this mean in terms of trying to conceive? Should I bd the day before getting this? Or now? Just trying to organise myself for my next cycle. The test line was a lot darker than the control line so I'm guessing today is the day I ovulate. I'm going to keep  
testing for the next 2 days to see how it fades. 
Thank you for your help! I'm just trying to get my head round all of this. Who knew it would be this complicated.