not sure what is happening

Hi everyone im a little confused any help would be much appreciated  

I finished my period 16th December 5 days later I had brown spotting with bright red blood.

Since then I have had yellow discharge and white very stringy cloudy discharge too (sorry tmi) I feel nauseous and tired all the time and im wanting milk ( one of my craving with my other children) 

Im confused could I be pregnant! And if so when can I test X