What could be up? preggo?

Last month my period was on the 23rd, the month b4 that it was the 17th. I ovulated this month on the 9-14th I've been craving salt and seafood, my are sore(normal pms 4 me) but they are heavier and squishier then normal. I also had a slight gush of creamy white discharge. (Sorry TMI) also slight cramps and twinges in lower stomach. Also had headaches and heartburn about a week ago. What gives?