t line is the test line while c is the control line. if there's a faint line on the T it means that you're likely pregnant. you can test again in a few days and the t line should get darker. provided the C line is also there to prove that the test kit is working. You can refer to the instructions guide that usually comes with the pregnancy kit for usage and readings of results. all the best!
for some people the hcg level will be low so the line might be lighter. please check once more with the first pee in the morning on https://testmyspeed.onl/.