It's my last chance, I also same as Sally, 40 this year... I still got 1 frozen embryo, but it is unlikely I'll try it. Based on last round and this round experience, I gathered it is egg quality issue not implantation issue. Cuz first round they took out 8 egg, 7 fertilized, 1 went into full blastocyst, while the other is in early blastocyst when they put it back to my uterus in day 5. I suppose to have 3 to freeze as they also show sign of early blastocyst but they stop developing the day before they freeze them. I ended up with zero freezing. The two that was in me implanted, but stopped developing half way, I started bleeding and the reading of my Hcg was only 90, thou it went up 2 days later but Dr THH was saying the reading is too low for a healthy baby, classifying it as chemical pregnancy. Then this round, they only manage to retrieve 3 out of 10 follicles. Although all 3 manage to fertilize and develop well for day 2, they decided to freeze 1, and implant 2. The embryologist said, the outcome would be the same... meaning if it is good and will go into blastocyst for successful implantation and development it will. So you see... now I don't even think I'll give that frozen embryo a chance. It's disappointing no doubt, but if the chromosome in the egg is not functioning well, then that could really be the reason why I can't conceive actually. IVF also cannot help.