Afraid I'm doing something wrong...

Ugh, I have yet to find two blue lines on that damned ovulation stick! I have gone through a whole box and am now testing two times a day. last month it seemed so much easier. Of course, now that we have sperm ready that’s not the case. I am wondering, am I using too much urine? Not enough? Not waiting inbetween going to the bathroom and checking long enough (turns out you have to not have gone potty for 4 hours inbetween checking) and indeed you can pee too much or too little on it! I am reading websites, now I read that women can ovulate anywhere between day 8 and 20 of thier cycle. Well, I started testing before day 8 and it is now day 13…I couldn’t have missed it unless I peed too much or too little or did something wrong. Please, Please let this work….I don’t think I am stressing myself too much, I have felt much more stressed in my life before, so that cannot be it.Please let it produce two lines tonight….this afternoon, something…I want to be able to go in tomorrow or sunday! Please, it would be the best birthday present!