@Jenandsquid I'm thinking it's the egg that knows to attach to the body but that is a completely unscientific idea.. Just how I imagine it.. Like the egg cosying it's way into the lining.
I had my planning appointment today. Because I have low amh I'm on a long acting injection at the start (rather than multiple injections) and then have to do two more needles before egg pick up around the 9th of March. It's all feeling a little more real now! If af arrives on the 24th I'm good to start injections on the 25th!!!