I have Scoliosis.?

when i was 12 we found out that i had scoliosis. by the time we found it it was so bad that i had to have bars put in my back to keep it from getting worse. six weeks after surgery i jumped into a pool and broke the bars loose. a year after that they were removed. when i was 18 i met and married a man that loved me even though i had scoliosis. when i was twenty i gave birth to our first son natural. sixteen months later i gave birth to our first daughter cesarian. 2 and a half years later i gave birth to my second son cesarian. 4 months later i chose the marina IUD for birth cntrol. the tests said i was not pregnant.my husband and i even used protection to prevent pregnancy. some how i ended up pregnant.by the time i found out, they couldnt remove the IUD.when i was in my 12th week i miscarried. held my unborn daughter in my hands. she was no bigger than my thumb.after a DNC i almost bled to death. i was checked out no scar tissue. so why has my period changed fro monthly to quarterly?