Hcg and Progesterone

Mandy • 29 years old - Married October 2013 - Mom of Baby Girl Dec 2015 😊 Expecting Baby Boy April 2018 ☺️
So I took a test 7 days after my HCG and it showed the most absolutely faint positive. You had to squint to see it. I'm 10dpo and took another test to see if had gotten any darker (implying in pregnant) however it was the same barely visible line. Could this be a true positive or just a very stubborn line from the HCG shot? Also, my chart is triphasic - could that be progesterone related??