Officially trying. Any tips?

So since getting the implanon out in January, hubby and I have been using the pull out method most of the time. My plan was to lose weight before we started trying. Well i have lost 37 pounds since mid February. We have decided we are going to start trying while I continue to try to lose weight. 
I have been charting my bbt since last month, just to become acquainted with it. I also purchased some opk and hpt that should be here soon. I am currently on my period now. My question is should I continue to chart my bbt and relax and just have sex the first month or so before using the opks or should I go ahead and use them my first month?