Question: what is the first day of my last period?
Answer: When your health care provider asks you: “When was your last period?” The answer is the date of the first day of your last period (not the day it ended). Ex. = February 2nd. To figure out how long your cycle is, start at cycle day 1 of your last menstrual cycle and begin counting (Cycle day 1,2,3,4 and so forth).