Menstrual cycle is usually 5-7 days however this month 1-2 days was heavy with clots. then nothing next on the 4th day light 5th nothing again. should i be concerned of a miscarriage or could it just be stress related? any advice?

Stress/miscarriage: Heavy and irregular cycles are multifactorial. In a young person with normally regular cycles there is usually an acute disturbance that caused the irregularity like stress, illness, change in bowel habit, etc. No real concern for miscarriage unless that has occurred in the past spontaneously. Increasing water intake, with increased raw fiber, i.e. dark leafy greens helps the body regulate.