it has been 6 months since my last period. i am not pregnant. they have done ultrasounds back and forth and everything seems to be alright. since i got married in 08/04 i have gained 53 pounds. could weight be the main reason i lost my period? since last week, i have noticed that sometimes when i pee a little bit of blood comes out. what causes that? please help me...

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Female , Age: 19