@Ashley how many IUI cycles until you fell pregnant? If you don't mind me asking.
For my one and only IUI, the egg they were tracking was measuring about 20mm. There was a second smaller egg on the other side that was only measuring 13mm and they told me not to worry about it because it was too small to be viable and would just be absorbed into the uterine lining. So, yeah, now I have a set of fraternal twins.
Yes! I’ve had cycles where they were slow grow in the beginning then grew so fast overnight. I don’t think slow growth is a concern as long as it gets to where it needs to be