The difference between 3-day and 5-day transfers is that with 5-day transfers you have a better idea of the quality of the embryos, so it's easier to pick the stronger ones. Another thing that can help is ICSI, especially if you have male-factor infertility. That's when they inject each egg with a sperm, instead of letting the sperm penetrate the eggs themselves. And lastly, fertility clinics have different success rates, so the place you go can technically impact the results, too. Although there are different definitions on what is considered a successful IVF (there is a difference, for example, on the number of pregnancies achieved vs. the number of live births following IVF), so it's sometimes hard to compare different clinics.
But the biggest factor is probably how well you respond to the meds, and how well your embryos do, which in part is affected by your age, lifestyle and health.
Best of luck with everything!
Great answer Heather couldnt have put it better myself!!
Just about the success rate thing like heather said diff clinics have different sucess rates i was thrilled when i heard the one im at had a success rate of 70% then to find out only 35% were live births so make sure you ask for both statistics!!
Good luck with whatever method you decide!!
I agree 100% with Heather and Amy!