No period after IUD removal

I got my IUD taken out over a month ago. But last month I did get my period normally when I was suppose to. I had sex last month too right before I got my period and decided to take a plan b pill. But this month I'm over a week late and I'm kind of worried. I've taken 2 pregnancy tests (from the dollar tree) both negative. So I'm sure it's the IUD, has anyone had issues getting their period after the IUD removal? I'm just a bit lost since I got my period last month but not this month.
Also a couple days ago I started feeling like to vomit and had a tight stomach pain so that's what made me taking a pregnancy test