The two week wait. Those 16 long, long days between when your embryo is implanted, and you find out if you are pregnant.  The abbreviation TWW or 2WW is known to every fertility patient who has travelled this road before. It’s a uniquely agonising and hopeful time, when many women find themselves focussing in hyper-detail on every feeling in their bodies, wondering if each tiny twinge or cramp signifies that their lives are about to change forever. That their dreams are about to come true.