I agree with Quinns momma!! It took me 6month to get pregnant after stoping the depo.
Depo provera is notorious for staying in your system longer than any other birth control once it is stopped. It can remain in your system for 12-18 months. Some women luck out and can get pregnant quickly, other women take over a year.
Unlikely u could be pregnant from that encounter. Esp if you were taking the shot as directed. Stranger things have happened tho so take a test.