It's been 2 months since learning some pua stuff! Been practicing a lot just weeks ago, got laid last wednesday

but damn! there's this one girl that's bugging me, She was really my type before I knew what pua is. Being a little bit more confident and armed with knowledge, last December I've made my approach on her, talked to her, number closed her but did not follow up.
Since we're going on the same university, just today, we passed by each other unexpectedly, I wanted to talk to her but damn! my heart suddenly beats so fast, felt so anxious and got blank so I just smiled at her. But before that, just a few nights ago maybe 2 while watching a very boring tv show, I don't know how and why, suddenly this girl suddenly popped on my mind and my heart suddenly beats fast, I want to keep her out of my mind but I can't and up to this time while writing this every time she passes my mind my heart always beats faster than normal. She's the only girl that's making me like this even though I barely knew her.
Is this normal? Help! Advices are gladly appreciated!