Cycle length?

Hope

This is my first cycle taking femera, Gonal F, and HCG trigger shots. How long does your cycle typically lasts on the medications? I usually have a longer cycle 31-35 days and my nurse told me not to test until CD 28 due to the HCG shot, but said if I’m not pregnant I’ll start my period before then. So I was curious how long your cycle typically is on the meds?