TTC after IUD


So my husband and decided to try for a child together we have three altogether from previous relationships. After I had my second I had my OB put in an IUD and after 3 years had it removed. The first week of having it removed I was spotting and have yet to have my period. We have been TTC and I'm completely unsure when I'm ovulating due to not having my period. Any of you had IUD and give some advice?