This is nothing to worry about, I promise you won't bleed to death! As long as it is not pad filling blood every 2hours you are okay!
Most women do have unusual bleeding with birth control, for at least the first few months anyway...
I had an iud, mirena..I had it for 1.5 years..Bled everyday.. I wanted the hormone free one, but got the hormonal one instead because it was available =) I wanted to see if it would ever 'mesh nicely' with ym body, well it obviously did not..I now have a copper iud, which is hormone free..No spotting or bleeding, and I am fine...
The moral is it is annoying! It sucks, but it will not kill you, and it is nothing to be worried about...