I went to the doctor today, he examined my groin and testicles, he felt no lumps and no major swelling, he thinks it might be Epididymitis. He prescribed me some antibiotics and told me to get a urine sample for him.
He also did the cough test where he felt around different areas of my groin and told me to cough, he said on the left side he felt a bit of an impulse, but he didn't seem overly concerned about it, he said to get the urine sample in and take the antibiotics and if it hasn't cleared up within a week to come back and he might do an ultrasound.
Another update: My doctor got my urine sample back and said he found no infection, but he did find some traces of blood in there. He didn't seem too worried about it though, just told me to go on with my antibiotics and maybe follow it up in a few months.
He said maybe in a month do another urine test and if its still there they may do an ultrasound to see if there is anything there, I said Is this something I should be worried about and he said "no, not now", and seemed pretty relaxed about it.
The fact that he pretty much said just to wait a few months then follow it up shows me he's not overly alerted by it.