Smoking effecting periods?

So I gave birth to my daughter last year in April. She is now almost 15 months and I am still breastfeeding her. Even with breastfeeding I have had regular monthly periods. We are currently trying for our second child and miscarried in February. Since then my cycles have regulated and we are trying again. Last month my period came a week earlier than expected (definitely not normal for me) so I took a pregnancy test once the bleeding stopped and im pretty sure it was negative. I took one the next morning and I thought I saw a faint positive but now it looks dried so im unsure if it's now just an evaporation line. Im still feeling really off since then but my question is, (if I'm not pregnant) has smoking ever messed up your cycle randomly? It never once bothered my cycles so Im just trying to figure out what the early period was about