TTC after Depo shot... HELP!

I was on the depo shot for 4 years, I took my last shot in May and it was done in August. I went on the Evra patch In the middle of August and I got my period back October 1st then my second one November 7. By those 2 periods I figured my cycles were 37 days long. After my period in November I stopped putting the Evra patch on because my boyfriend and I decided it was time we started trying for a baby and was supposed to get my period December 14th but never got it and kept getting negative pregnancy tests and now I was supposed to get my period Jan 20th but I still haven't gotten it. Do you think Evra patch was regulating my period?