Hopeful once again...what is wrong with me??

I really don't know why I keep doing this to myself month after month. Every month, no matter how bad my temps look (and knowing full well how poor our chances are with our sperm counts) I continue to become hopeful at this point in my cycle. I cannot control it (believe me I would if I could since the disappointment is so much worse after becoming hopeful) but here I am at 6 DPO and I am thinking about the tiny baby that may be growing inside me. I guess I just keep rationalizing and thinking...why not? Why can't I be pregnant? We did it before. After a couple of years of trying half-heartedly, (due to finding out that we had no or very few sperm) on our second month of actually charting temps we were pregnant with our very first little baby. I am so sad that we lost her (I think she was a little girl). But now, here I am at 6 DPO and I think (while attempting to avoid these thoughts for fear of jinxing the whole thing) that we may be pregnant again. There is no real reason for these thoughts. I have them every month. Nothing is really different. Every month I have *symptoms* that I am sure indicate that we finally have a little one growing....and every month since the miscarriage in June, I have been wrong.  But every new month, I feel that the symptoms are a little different and that this could be it. Sad, I know...but it makes be happy to *believe* that I might be pregnant again each month. This month, my temps are not very high (in the 97.7 range) but I began to feel breast tenderness at 5 DPO and it continues and has actually gotten worse. I have also been feeling slight cramping/tugging in my abdomen and thought that I felt a little ill yesterday morning. Yes, all of these symptoms have been felt by me before on numerous occasions when I was NOT pregnant....but once again, I feel the hope welling inside me....and I cannot control the feelings that it may be possible this month. *sigh* How long can I do this? We have decided to go to see our RE and move on to IUI's if we are not successful this cycle...so we will try to get an appointment within the next week or two to discuss our next plan of action. But in the meantime...I will continue to be hopeful and pray that we already have a little baby beginning his/her journey into our arms next summer.