Is my cycle changing? I am 6 days late.

Hy dear,, sometimes this happen due to stress or tiredness and change of diet, if u still very concern and think nothing of the obove is link to your lifestyle then check with a doctor.. wish u luck take care
Kind regards.

Is there a possibility of pregnancy? Have you had sex, protected or unprotected?

If pregnancy is a possibility then wait until you're at least 2 weeks late, then test using first morning urine. If that test is negative, wait until your next period is due. If you miss it as well, test again or see your doctor for a more accurate blood test.

There are many things that can delay a period, stress, weight loss, weight gain, illness, medication, exercise, etc etc. But, if you're sexually active the main concern is always pregnancy. That should be ruled out first.