I have felt signs of not being utd for so long that if anything was to change I would know. Except my m/c last year. Every symptom I felt had a reason behind it and the biggest indicator of all that I thought I wasn't utd-I had AF! These were my symptoms and what I thought it was:

1. AF came and went.
2. Sore boobs went as AF finished (but then came back the day before I tested)
3. I was taking metronizadole antibiotic witch left a horrible metallic taste in my mouth and made me feel nauseas.
4. For 2 days I was so tired and felt like absolute crap. But Dh and I had 2 massive fights leaving me crying myself to sleep and therefore waking up feeling awful and puffy eyed.

The only thing I thought was strange was I could smell a ladies perfume from the back of house at work. Then i tested the next day. I would like to think that had it not been for the fights, AF and the antibiotics, I would have known.