Period is due in 7 days and is never early. Started bleeding bright red medium flow today, no pain. Had light pink spotting at ovulation. Miscarriage?

Possible. It is possible you had a miscarriage, or that you never became pregnant this month. It is normal for there to be some variation in the cycle length from month to month. If you have been trying to conceive with regular intercourse for over a year, you might consider seeing a fertility specialist who can help you.
May be may be not. Even in women who have regular periods, once in a while it can start a week early. Bleeding due to miscarriage is usually heavier and may be associated with some cramps. Get in touch with your obgyn if bleeding gets heavier than usual.