Getting Frustrated Help!

So I just got off of my implanon on December 3rd. I was on it for 2 and a half years with no AF. I got my AF exactly 2 weeks later after the removal. Everything was normal like before. Now this month I have not had anything and have had horribly nausious all the time. I have done tests every week and nothing. Could it just be my body getting the normal? I did an ovulation test after my AF and it was positive haven't tried one yet. So confused!!