For about the last half an hour or so I've had sharp twinges in the left hand side lower stomach area. Seems to be right about where the embryo was put - could it be implantation?? Not sure if i'm just reading too much into it... After being so sure yesterday that it hasn't worked I'm starting to think maybe I could be in with a chance. This is about the right timing for implantation but I don't know if that's something that can or can't be felt...