Quitting smoking?

Jess
I quit smoking November 20th 2015.. My period was 14th to the 19th of November.. And then in December I have completely skipped my period. No symptoms at all besides minor cramping, and I've been constipated for like 2 weeks now! My hubby and I are TTC but unfortunately I have gotten all negative tests. The nurse at my OB told me not to make an appt until I've missed my period for January too. So am I just getting my hopes up ?can quitting cause you to completely skip a period with no symptoms whatsoever ?