Has anyine ever had to get a gallbladder removed and was currently taking warfarin for a dvt in the led?

I had a dvt in my leg in oct. 2010 2 days after giving birth and I'm on coumidin (warfarin) 9 mg and they told me I have to stop my medicine 1 week before surgery amd after the surgery they will put me on lovenox......has anyone ever had this happen before? And 2). Should I be scared????? What will happen ...