Possible pregnancy following abortion.

I had an abortion March 29th and got on birth control (IUD) the same day.... Two days ago, my guy asked me “why do you still have that line on your stomach from being pregnant”..... I’m on birth control so I’m like ion know maybe it didn’t go away yet I never really paid attention to it... I don’t think I’m pregnant and certainly hope I’m not pregnant but I took a test and the line is faint on all 3 test that I took. I’m not sure if it’s from hormones from my last pregnancy or what but I’m freaking out. I see my doctor next Monday which seems so far away. I don’t think I can put myself through another abortion but at the same time don’t want another baby. It sucks that my IUD possibly failed me.