iud help

hey ive got the iud mirina, and i was woundring if you can get pregnant on them? and if any1 knows anyone that has. ive had mine scince nov07 and my periods where alway coming and going but now i havint had it scince apiril, and ive been feeling quite sick and dizzy expecually when im hungry, and ive had some light cramping on my right side and some heavy cramping in my lower abbdimin (like the begining on labour type cramp) i took a pregnancy test about a week and a half ago and it was neg, but when i was pregnant with mila i started to have symptoms the very next day. please help

The chances of getting pregnant with a Mirena are next to nothing, but there is always a risk.
It is normal for your periods to stop or become erratic with the Mirena, mine sometimes goes away for a few months and then I'll start getting regular monthly spotting again and then nothing again.
I'd suggest going to your docs for bloods if you can, just to find out for sure as there is the increased risk of ectopic with Mirena as well, and then if its not pregnancy they can try to work out what's making you feel so yuck.
Good luck chicky!