My period was a week early, very heavy, blood clots and gushing. it lasted 9 days. next period came 2 weeks late. neg preg tests.

Irregular periods: Irregular periods are one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections, polyps, fibroids & hormonal changes can cause spotting. There are many options available to help regulate the menstrual cycle. Schedule a visit.

Cycles: Could be a normal fluctuation in your cycles. Keep a menstrual calendar and track your periods. After 6 months if inconsistent cycles continue, take your calendar to your provider to work out a plan.

Abnormal periods: We would want to rule out a miscarriage at the time of the first abnormal period. When did you do the pregnancy test? If it was after the first period by many days and it was a miscarriage, the HCG levels might have declined to detectable levels. Consult with your GYN if the periods remain abnormal.