Progressing, But Vein on Shaft Got Hard?

Hey guys, new account here, I’d have loved to post in the injuries forum, but I can’t do so until 2 weeks from now. Hoping someone can give me some insight as to what has happened.

So I’ve been doing a mixture of stretches, minimal jelqing, semi-erect bends and clamping. I’ve gained about .25” over the course of 8 months in girth. I am hoping to gain around .5” more and I’ll be done. I don’t want any length as I am already really long to begin with, but my girth had been average, now a little bit above average. Before this I would not gain through even the most concentrated PE regiments. I’ve tried it all, but this is the only routine that’s working for me. I’m a real lurker, but I’ve been doing PE on and off for around 9 years — during that time I gained just .25” in girth (4 years into it and I gained nothing, but realised stretching played a huge part in gaining girth).

So now, during my last session about 4 days ago, I noticed a hard, painless vein running from right under my glans on the left side to the base. It is noticeable and a little elastic when I’m soft, but gets hard and more noticeable when erect. Once again, there’s no pain in or around the vein, it’s just hard and wasn’t there before. Can this be a thrombosed vein?