Timing and OPKs

Hi all! So I've never done opk but I've been charting for over two years, I used it as my form of birth control. Now that we're TTC I'm a little confused about ovulation pain and temp peaks, because I usually have pain for a day or two during my EWCM and then my temp peak happens and the pain and EWCM go away. Soooo that being said, should we be DTD around the time I have the pain, or before? I'm not sure if the pain means it's too late?