First off congratulations on completing three days. The first week is always the hardest. Morning erections are a great sign also!
As for whether or not quitting porn can increase testosterone, I would imagine the answer is no. Quitting porn on its own and not changing anything else in your lifestyle probably won’t increase your testosterone. That being said; a healthy clean diet, good hydration and getting on a workout schedule will definitely lead to increased testosterone. Try to cut out junk foods and excessive sugar, get outside and get some sun. Decrease stress and get more SLEEP!
I have also read a study that was conducted years ago about participants who abstained from orgasm and had their testosterone levels evaluated, there was a spike of 140% on days 7-8 then a gradual decline after that initial spike. If you Google “7 day testosterone spike”you’ll probably find the article.
Either way staying off porn will only provide benefits.