I went through similar when DH and I were TTC, I actually used to posted about it in the TTC board, I had the most regular cycles (like clockwork 9am on the 28th day of my cycle... BAM there she was) then I got married and DH and I decided it was time to start our family, the very first month day 28 comes and goes, day 35 comes and goes, I am throwing up in the morning, smells put me right off, i just felt off, not myself, I did a HPT Negative, finally called my doctor and went for bloodwork which also came back negative, I seriously thought there was something wrong with me, why was I getting symptoms if I wasn't pregnant, my doctor sat me down and explained that it is actually common when you want it that bad for your body to actually construe those symptoms. I had that happen nearly monthly for 15 months, I got to a point where seeing a negative was common practice for me, DH and I saw fertility specialists and had tests and they found out DH had a vericocele and told us until it was corrected we had less than a 10% chance of conceiving naturally, I had given up hope. 24 days after being given that information, I pee'd on a stick (much like other ladies have said I was a POAS addict) I think at this point it was actually just habit. I looked down at the test then tossed it in the garbage as I had done probably 100 times, then realized that there was a second line (yes i went rooting through my garbage to find that little stick). so what I am trying to say is if you are not pregnant and do wish to be pregnant, try not to put so much pressure on yourself, that is honestly my best advice to you! I literally conceived my baby 7 days after being told it was nearly impossible (i think it helped me to relax as there was no pressure to get pregnant until after DH's operation). GL hun and I hope for nothing but the best for you no matter what your outcome.