Please help!

Samantha
I had an hcg trigger shot on the 6th. Dr said to do pregnancy test in two weeks but of course I didn't wait that long. Tuesday I tested and got a faint + but the drs nurse said it's probably still from the trigger. She said to test Sunday and if it's still positive I go in Monday for a blood test. Being a true POAS addict, I tested today. Lol I guess my question is for those who have been in this situation. Is it possible that this is still from the trigger? Even though it seems darker today than Tuesday?