I was the same as you when i was TTC i had had two M/C and was desperate to fall pregnant again so each month i though that i had all sorts of symptoms when in theory i didnt it was just me THINKING that i had the symptoms. The way i managed to fall pregnant was i got engaged and we had a big party and it took my mind off it as i had the party to arrange plus we said that we would marry in 2010 so i was starting to get the wedding priced up and i swear because i couldnt remember when i had come on and when i would ovulate that was why i fell pregnant as it completely took my mind off it!!!! My advise is just relax and try not to get to ingrossed in it i know that it is easier said than done but it can take over your life as it very nearly did mine and my partner noticed too as i was like a time clock telling him when we could and couldnt bed!!!!
It does sound like you're thinking too much about it, honey, but you never know when it will be the real thing! Good luck! Take a test as soon as you miss your period and relax!
Well good luck! Let us know when you test!