I agree, do a test to be sure.
I think the body and mind play tricks on us sometimes, a few weeks ago I had a virus which made me feel identical to the early days of when I was pg with DS2. I did about 4 pg tests over 3 weeks, I was so convinced I must have been pg. I felt EXACTLY the same. But I wasn't ... and I kinda knew that I most likely couldn't have been.
Hope you have the result you want.