progesterone and late period

Amber • Have one sweet lil lady, but she would make one awesome big sister:) Trying for baby #2 for 5 years now.
My doc told me to take progesterone this cycle from day 20-30. Still no period or sign of period, and it's day 31. I'm usually a 28 day gal. Is progesterone making period late? Trying not to get hopes up, but have been trying for 4 years.