Hi and thanks for using the forum.
Since you have been off the depo for four months and you had unprotected sex, yes you could be pregnant. You would need to repeat the pregnancy test as suggested by your doctor. Generally, it is not advised that you have the depo shot unless you have an accurate negative pregnancy test. Be sure to take the follow up test. Good luck.
Bridget
i soor had sex the day before i had to go get my next shot but they still gave me the shot and told me if so that i was gone end up pregnant that it wouldnt harm the baby