Not sure if im Pregnant

Hi ladies, 

Not trying to concieve, but last 3 weeks ive had the following symptoms. Nausea, throughout the day, but not all day, Super tired. A bit dizzy. Loss of appetite. Feeling foggy in the head, a bit stupid (more than usual lol)

I was on the depo injection. Missed the date i needed to go back, finally went about 2 and half weeks later.

So really dont even know if falling pregnant is a possibility