Hi, im curious if i could be pregnant? I had intercourse on dec. 19th. I think i had implantation bleeding on dec. 25 i dont expect my period until jan 7 it lasted only 3 days, light brown. My breast are beginning to be sore. Little darkening of the area around my nipples. Nausea comes and goes throughout the day, goes away when i eat, comes back hrs later. Having fatigue. Some yummy cravings. Headaces and backaces that also come and go throughout the day. Some white discharge comes during the day. What could this mean?