Kelly, my understanding also of short protocol is not having down reg. I'm not really sure about shorter down reg. In my clinic, 2 weeks of down reg plus 2 weeks of stimming is still called a long protocol.
I got this from this website https://www.guardian.co.uk/society/2007/jul/04/health.medicineandhealth1:
"There are two basic protocols for conventional IVF - the long and the short. In the long protocol, drugs are given in a nasal spray or injections to stop the ovaries and throw the woman into a temporary menopause that can last for some weeks. The process is known as "down regulation". Then she will be taught to inject herself with another drug under the skin every day for a further week and a half to stimulate the ovaries to produce many eggs. Finally, a third drug is injected to make the eggs ripen ready for egg collection. The short protocol takes roughly four weeks as opposed to about six, is matched to the woman's cycle and involves less of the initial ovary suppression drug."