Hi My third depo injection was due 20 may 2015

Patient: Hi My third depo injection was due 20 may 2015 nd was unable to go and get injection. Then 23 May 2015 I went to the Dr I got Depo injection. After got the depo injecton on the same day 23 May I did unprotected sex. Can I be preg and when can I do preg test. I am very worried please assist

Symptoms: Feeling tired, pains on my back

Doctor: