my wife had her third ivf cycle at the end of october, but once again the process was unsuccessful

she had her treatment at st barts in london. What I find difficult to understand is that everything went according to plan and after the embryo transfer when having to wait for 2 weeks to find out whether the process has resulted in a pregnancy, my wife started bleeding between the 10th and 13th day. This is so disheartening. Doctors keep telling us that my wife has less of a chance of getting pregnant as she is 40 years old. My wife had an ectopic pregnancy as a result of which her right fillipoean tube was removed. Her left filliopean tube appears to be blocked with fluid.