Should you be worried? The NHS website says blood in semen is not usually prostate cancer. A rise in psa is often not that either.
However it's better to worry than to be complacent. I'd be telling myself it's unlikely. Although in darker moments, around 3am, I'd probably be thinking I was the one. A psa of nearly 3 is low and the doctors have found nothing.
Some would say a TRUs biopsy isn't enough so have a template biopsy.
On the other hand many men have prostate cancer but it doesn't develop so there's always a risk of overtreating. Try to keep a level head and don't over-react. Once you start on this treadmill it's hard to get off. So you perhaps could wait a bit and watch your psa or ask for a template biopsy. Take the route that will calm your nerves, there's no point in spending a lot of time worrying because you didn't ask for more diagnosis. It's better to decide what you want and keep on that track.
We're all different and our cases usually have subtle differences.
All the best,