Mass on right ovary

Hi all!  I was having some slight spotting, and started to have pain on my right side, so I went to the dr.  We thought it was from the IUD, so the dr ordered a transvaginal sonogram to see if the iud was in place.  It was, but they saw a 4 cm mass on my right ovary.  I immediately freaked out.  The dr assured me that she is 99% sure it is not cancer, and she thinks it is a dermoid cyst.  I am 29 with 2 kids.  I am freaking out at the possibility that this is cancer.  She scheduled me for surgery for this wed.  I am having the whole ovary removed, as we are done having kids.  

Is it normal to bleed with a dermoid?  She thinks it is trying to twist or something, which is why she wants me in surgery.  She said it did not look like a suspicious tumor, but I am just filled with doubt (I struggle with this anyway).

Please help me settle down!

[Silvara]

Read the Health Pages in the upper right corner of this page.  They're very helpful.  95% of cysts are benign.  Just keep thinking in those terms and you'll feel a bit better.  It takes awhile to calm down, but you will.  It's scary to be told something is going on with your ovary, but think positively that it's just a dermoid and you'll be fine soon!

Deep breaths!