I'm so glad you and your baby are OK
I'm not a doctor, but my guess is that you had a slip, probably fairly early on and that's what may have caused your problems - did you ever have a fill under fluoro or was it "blind fills"? If you did have a slip, that would be why the band seemed too low and crooked upon removal - that's what a slip looks like and would explain why it suddenly became tighter - it probably continued to slip and felt tighter as your pregnancy proceeded and you started to retain fluids. Most women don't even need an unfill during pregnancy, but some do, a removal is very rare! But if in fact it was a slip, and was worsening, this is what would happen. I'm glad you and your baby are OK!! Keep us posted do you know what you are having?