So I am about 2 days late as my average cycle is 28 days and I started bbt this very cycle so I don't have much to compare to however what's tipping me off is unusual fatigue, as in I sleep for 7-9 hours and I wake up feeling okay but 3 hours later I am ready to nap. Also, I have been very hungry the last few days, my boobs have been sore for at least 2 weeks now as they started hurting when I normally get pms. They also seem slightly heavy but it could totally be in my head.