What is happening to my crown area??

[Dyno]

As of right now, I only have progressed thinning in my crown area at age 37. The rest of my hair feels full and thick.

So late July I started with micro-needling 1-2 times a week with 1.0mm in that area and using rosemary oil whenever possible. I mix it in with my shampoo and also mix it with a carrier oil whenever I can and leave it on for a couple of hours before I shower. After a month of doing this, I can feel short prickly hairs growing all in my crown area. However, I can't see any hairs there in the mirror and my girlfriend can't see any in that area...but we both feel the short prickly hairs there. Is that what happens when it's first growing in? Is the hair like transparent when it's first coming in? This is really weird, there's definitely prickly hairs there that weren't there before.

Thanks for any help.