New member here! have I already relapsed?

Hello, I just started this whole thing 3 days ago!

A little bit about me: I am 18 and a huge porn addict, and masturbate with whatever material i can get. Most of the times it's 2-3 times per day (sometimes it was way more), and i did it to temporarily relieve myself from stress.

And today, I've sinned. i watched porn for about 15 minutes, one thing lead to another and i found myself missing my ex and watching porn videos to remind myself about all the emotions that happened we we used to make love. I got a hard erection,but I didn't have any urges to masturbate because i knew i was trying to be a NoFap devotee. Yet, I'm kinda unfamiliar with the whole relapsing concept. What I've done, does it count as a relapse?

thanks guys