Phez have you been dtd recently? Don't worry, even if this isn't your month I know it will happen soon. Perhaps your cycles are still regulating a bit.
I don't know enough about charts to help you but maybe if you create a new thread someone will help.
I hope this means ovulation now. Scans aren't always 100% and surely if your cyst was that big it would have been difficult to see the whole ovary? And did they look at the other one?