confused

im so confused okay so im officaly 2 weeks late on my period and i have tons of sym. but i just got my iud taken out last tuesday because my body rejected it and i could possible be pregnant! well i have taken 4 test and they all came out negative...i just dont know what going on..i know with my last two kids it took me atleast until i was 8 weeks to show on a pregnancy test and get any sym. i just dont know did anyone have this problem when there where on the iud paraguard?