Hi Keenmom!!
Firstly, no it is not imposssible to have success with your first try! We conceived my LG 4,5 years ago in the first month of trying (and only one BD session!) with only half of my reproductive organs functioning well! No fertility drugs. So, yes it is possible.
Having said that, I have tried to conceive in the beginning of this year for baby no. 2 and in 6 months still no luck. Many of those months I had a lot symptoms that could be classified as early pregnancy symptoms. So, yes, your mind can play tricks on you and unfortunately PMS symptoms and early pregnancy symptoms are the same...
But I do remember having very sharp pains and cramps with my LG at around 10 DPO. I did a home pregnancy test on day 11 and it was very faintly positive. Some people get a faint positive as early as 9 DPO (days past ovulation). So, it all depends if you want to spend your money on HPT (home pregnancy tests) or perhaps a slap of lindt chocolate for the month if you can't wait for your period to confirm results!
Good luck with the wait...It is a killer!
Baby dust to you! FX ! xx
www.bellybelly.com.au/pregnancy/pregnanc...egnancy#.Ued_N220qrg