Can you get pregnant right after having an iud taken out and am i pregnant?

ok i had my daughter 12/24/07 did the after bleed after i had her but after that would not get a peiord nothin would start my peiord to go back to regular every month but theni got on the iud the mirena one dont know if it is hormonal or not but the i got it removed 1-26-09 got a period i waited to 11 days later to start using the opk so i started on the 5th on the 6th it was positive i use the opk up untill the 11th and they all came out positive but when i took a blood test last week 2-18-09 got my results by next day it came out negative would that even be to soon to tak a blood test i heard from some people that it would im suppose to get my period on the 26th now i kinda have sypothoms of both my back hurts not to much wit nasuea but didnt with my daughter a lil crampy n i think my nipple part aint good at remembering the name of it but i think it is getting darker so idk what does anyone think i could i be pregnant