Pre-Cum

I have abstained from PMO for about 49 days (about to reach 50 days tonight). My main question and concern was my loss for concentration. These last couples weeks have been a rollercoaster, although I have not PMO at all, I've had sexual intercourse 3ish times lol. The first time, I had sex twice with this girl but the thing was, I never came during both of those times, which im presuming is all the porn ive watched (meaning I didn't cum because im so used to stuff that I like and it didn't satisfy my desires so that's why I never came) but I did pre-cum a couple of times. The second time was with this girl in her basement, we snuck out and we got down to our underwear but that was it. We dry humped and I did pre-cum alot of times. The thing is I never fully ejaculated during all of these times. So me concluding this short story, is this pre-cumming causing my memory concentration problems or is this just part of my withdrawls. Should I wait it out or not? The main thing I dont understand is, if it comes from my withdrawls then why is it so late in days for this to be happening now? I thought it was mostly in the 0-6 weeks to mostly see these symptoms. All opinions and answers matter! thanks for reading and understanding.