I totally agree with Blastoff, but I also know it's hard not to obsess just a little.
I really think you should look into that book- it is sooo helpful.
Don't worry about lube. Look at it like this: have you ever heard of anyone successfully using ONLY KY jelly as a method of birth control? No way. I think that only really matters if there are problems with your husband's sperm. Anyway, the night I got pregnant we used ky. And even though I knew I was ovulating, and even though I knew if we screwed it up it would be months before we'd have another shot at it (I have REALLY long cycles), we used lube because that's how we enjoy sex together. Without it it would not have been nearly as fun. This gets back to what to what Blastoff was saying: try to enjoy the sex. When you do end up pregnant, you don;t want to remember getting that way through dull, mechanical, unpassionate, baby-making. MAking love to make a baby is sexy in a whole different way. Enjoy it!