No period in 1 month

Ok so, i had my period may 14-18 2 weeks prior i stooped my birth control pills(they was not good and thats a long story) i have not had a period since then and im wanting to get the paragard iud but i cant until i have my period lol. So ive taken many pregnancy tests and 1 came out as a vvvvvvvvvf line (im thinking possible evap line) and the rest are neg (i never told my husband that ive taken any) well i called dr today and she told me to take a test tomorrow morning and if its negative then ill come in for blood pregnancy test and if thats negative then she wants to give me meds to make me have a period. So could i be pregnant that isnt showing up on a test? Please help my husband told me last night that if i am pregnant he is going to be pissed. He does not want anymore kids but i do (i dont want to get any birth control because it took over a year to conceive our second) so im getting this iud to make my husband happy. (Please dont say i should divorce or anything like that, he is the sole provider for our family and a 3rd child he wouldnt be able tobpay bills, we just bought our house)