Help please.!!..!!

I had the implona the rod in my arm. I got it January of this year. Well me and my husband decided that we wanted a baby together. So I got it taken out the beginning of July. I had what I guess to be not a normal period that lasted over a week. Well I have not had one since. And in August I took two test and they said negative. Has anyone else have this happen to them. If so. How long did it take to get a period?