My period was late this month. My usual cycle runs 32 or 36 days but this month it was 41. I recently lost 15 pounds and have been exercising a lot more often. I have also been under a bit of stress. I thought I could be pregnant, but a test came back negative. Now my period has finally started, but I a wondering if it will go back to normal after this? I am going on vacation in May and am really hoping not to have my period then. Any help or advice would be greatly appreciated.