Period or pregnant?

Delta
So for the past 10 months been ttc for number 3. Every month neg. this month I am to start af on 10-14 but for past week been saverly nasuaus and sensitive to smells and boobs have been extramly sore.and cramping and really tired and mood swings.  I started light spotting today 10-12 could It be implantation spotting? or am I starting af early for once?