1st time, hardly any symptoms until a few days before period was due. Then I suddenly off my food (had to physically spit out a piece of mango as I thought I was going to vom) and also, I just 'knew'. Sure enough, was a day late and got a BFP. I did also have a dry mouth & throat, but wasnt thirsty IYSWIM.
Next time, the first thing I noticed were my boobs! I remember catching a glimpse of myself getting in to the bath about 6 days before AF was due and got really freaked out. Boobs just looked different, the areola and nipples looked darker and swollen and had huge blue veins running around. Each day after that they got more and more painful to the point I was wearing a sports bra to bed, and I'm only a 34b!! Again, I went off my food when I got my BFP.
Both times, the days before AF was due I was getting the same pre-AF type symptoms (twinges & cramps, feeling of 'wetness' where I kept rushing to the loo expecting AF to be there!)
If you ask my DH, he'd tell you that my moods were horrific, and I admit I felt like a proper moody bitch for the full 2ww. 
Good luck!