There is a nice list here about typical symptoms during the 2WW period:

http://simplyivf.com/2WW_Do_s_and_Don_t.html

I went through (3) 2WWs; the third was a successful FET. It is hell! But I did have a few symptoms: I did have an elevated temperature which is what happens when you are pregnant, so keep track of your temperature. I also had a tightness in my right side. I took a HPT on day 6 and it was positive ...

Donna,

You still have a chance. Don't give up yet....It all depends on the sensitivity of the HPT that you have used. Some brands show a + as soon as your HCG level reaches 20mIU. Some will not show a + until that number is 100mIU. Also, remembers that your HCG levels will normally double every 48 ...

Hi.. I have a success story.
I had 2 failed IVF fresh cycles but the FET was a success. My son is now 3 months old. I owe it acupuncture and herbs. I am a believer now.
Pick an acupuncturist that knows alot about infertility. And read about the points before you go. Also, get him to recommend herbs ...