Hello ladies. I want to make sure I've got my timing right. When I get a positive on the wondflo OPKs (two dark lines) that's when We have been BD. I have had long surges the last 2 months, I've gotten a positive for like 1.5 days. Then it goes away, which I'm assuming is O. I haven't been temping but I do check cervical fluid. Am I timing it right? Is that what you are supposed to do? Start BD as soon as you get a positive? Help!!