When to baby dance question!

Lauren • Our little miracle Caroline arrived 1/28/15! Thanks glow!
Hi ladies...we are in our 2nd month ttc. My period is due Wednesday or thurs and so far my pregnancy tests have all been negative. This month my positive opk came on a Wednesday. We bd'd Monday, Wednesday, and Thursday. My opk was negative by Thursday morning. Fertility friend said this means i ovulated on Wednesday but I didn't get my temp spike til Friday.. My question is, I don't think I can handle bding every night as I get a little sore, but if I go every other do I time bd for the night before I expect my opk to be positive? I read online that's the ideal night...but that means I wouldn't bd on the day I got the opk? But then would on the day I probably ovulate? I'm so confused!