Hello, I would be happy to help you with your question.
It is certainly possible to be pregnant, but unlikely. The depo-shot is actually quite effective at preventing pregnancy
. The effect of the shot actually lasts a little bit longer than 12 weeks, so you were likely still protected during the time of unprotected intercourse
. That being said, nothing is 100%, so you should check a pregnancy test now and repeat it in one week. If it remains negative, then your symptoms are likely cycle related.
I hope that this helps. If you have more questions, please click on "ASK ME A QUESTION" link above to directly ask me a question!