Late period

I have been on birth control for a little over 3 years (implanon), however I had it taken out around November 20th. I started my period November 26th and it was normal in length. My husband and I have starting TTC. I was supposed to start again on December 24th. I have yet to start but don't want to be overly excited about the possibility of being pregnant if it's really just from my birth control. Any suggestions?