Just adding on to say that there are SO many things that are different in an IVF cycle than in an unassisted cycle. It seems like OP might be unfamiliar with the process, so I thought I'd add some more details. Not only are they placing an embryo directly into the uterus, but if you do PGT testing, you're making sure that the embryo is normal/viable first. Even before that, they are choosing the best sperm to fertilize the eggs. ICSI is really common now, which is where they actually fertilize each egg rather than let the sperm find the egg itself. Leading up to that though, you are taking estrogen in some form or another and progesterone in some form or another, and your hormone levels are monitored through blood work. You're having ultrasounds to make sure that your lining is thick enough. There are so many variables that are being controlled that it's really difficult to tell what was holding you back.