Usually you sould start trying 4-5 days before your predicted ovulation date. The reason is becaus esperms can stay alive in uterus for up to 5 dyas. When you start trying before your ovulation date, the sperm counts in your uterus are higher at the time of ovulation~hence increased chance of pregnancy. That is not to say your chances are not high to conceive. I ttced in July too, I hope we both have good news for each other soon.
I am a little unclear here? If you had your LH surge on the 17th/18th, that would mean ovulation anytime from the 18th-20th or so. If it were me, and I am correct in what you are saying, I would have had sex every day from the 17th to the 20th or so. Thats just me, but it has worked 3 times in the past that way.Alot of people say every 2nd day is best. As to whether or not you conceived, I wish I could tell you, but pretty much impossible to say. I do wish you luck though!! The two week wait now is terrible, I know. I am looking forward to someone inventing a test that can tell you sooner! Hope you get a positive!!
I dont know your age but my doc told me that the week I think I was ovulating to have sex starting a few days before that every other day. So if you were predicted the 17 and 19 I would of had sex the 15, 7, 19, 21