I had my period twice in one month and this last one lasted 9 days and this time it was brownish

Hi honey, irregular periods are the bain of a womans life! Always either making us worry or catching us off guard! The ONLY way you could be pregnant is if you had unprotected sex - no matter how long! IF you didn't then it's just one of those irritating things we have to endure! Our cycles can be as regular as clockwork then wham - sickness, medications, hormones, depression, stress etc. can send them off whack! Brown lining means it's just old that's all - it's just older lining sloughing off, instead of fresh "blood"! I hope this answers your question? If I can help you further just let me know OK? Good luck and health!