Passing large blood clots five days before period. Could this be an early miscarriage?

It is possible. But u should see your gyn asap or a gyn as u need an exam, blood work to r/o preg and other hormones and to check your hb level, and a pelvic ultrasound to check the uterus and ovaries, and you may possibly need an in office hysteroscopy to look at the endometrium and an endometrial biopsy and once your doc knows what the cause is then there are different treatment options.

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3/9 brown spotting 3/10 brown spotting into moment of red blood then back to spotting 3/11 spotting into red blood & clots Prd or early miscarriage?

Need more info. Did you miss a period? If you missed a period by more than 4-5 days and a pregnancy test was positive, it would be an early miscarriage, otherwise it is likely to be a normal variation in the cycle. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. You may consider implanted contraceptive or an IUD. Consult this site for more information on this topic. Practice safe sex. Get HPV vaccine. Read more...