@Kelly70 - don't give in just yet, you've still got some growing to do.
I too was told by my FS the same thing littlesparrow74 just wrote - they grow 2mm per day. So Monday look forward to a juicy 18mm, maybe with a couple of smaller ones. The lining would be doing its thing as well.
You and I are very similar in our cycles and I'm feeling it - right there with you. The one follicle that likes to super-dominate the rest. Well done "Dominator" I say, however hand over the golden egg! Give that follie of yours some positive good love thoughts.
I'm visualising mine with the golden egg in it too!
Did you find out your estradiol levels?
Remember that it's only one good one we need.