Delay of 13 days was at doctor's appointment. She said it might be pre…

Delay of 13 days was at doctor's appointment. She said it might be pregnancy and sent me for ultrasound on the 25th. But I am giving injections from my back, since the delay started, I have pain in my spine and it is radiating to the left ovary. Can you say that this could not be pregnancy but inflammation of appendages? I don't know what to think.