Periods have been short and shedding huge blood clots past two times. Unusual. Took two pregnancy test first one came up invalid 2nd one neg. Ideas?

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 ; hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.