Which due date did you go by ?

Is it weird that I’m secretly counting my pregnancy based on my own due date, 3/10. The doctor told me 3/8 at my first appointment (based on last menstrual period - 28 day cycle). At the second appointment the nurse told me my new date is 3/11 based on baby’s measurements - 1 day behind. But I feel like I know my body better than the doctor and I’ve been tracking my cycle for years now, long enough to know that I have an exact 30 day cycle, not 28 days. So I’m going by my own due date 3/10.