Help!?!?

I had my first child 2 years ago and me and my husband just had the bar taken out of my arm a month ago. We have been TTC even since. I took a pregnancy test Monday and it was negative. But I haven't had my period yet. After I got my IUD out my period came back right away. But after the bar was removed I haven't even had spotting. Could I be pregnant? Should I wait longer to see if a line shows up? When's the latest you guys have had your period after having the bar removed from your arm?