No monitored Femara cycle, ovulation question


I took 7.5 mgs Femara CD 3-7 last month. Ovulated on somewhere near CD 18, 19, or 20 based off of day 21 and 28 progesterone draw. Cycle started day 33. Taking the same dose of femara and same days again.

Will I ovulate the same day again? Or is there a possibilty I will ovulate earlier? Both times in the last year I have actually ovulated I got pregnant, both ended in miscarriage though. So last month was my first month ovulating with out conceiving.