I guess I did 'sense' it because towards the end of our holiday I was always rubbing my belly and talking to my belly when I had a shower or bath, saying things like "good work bubby getting through my blocked tubes!" The only "symptom" that I could have suspected was that I wasn't spotting before AF was due where I normally do spot every month. Maybe it was more wishful thinking, but then again maybe I just "knew". However I didn't actually believe it until I had my first couple of scans.