HappyH,
I have just been through a similar experience. I had been meaning to have a PSA test for over 10 years as my father has PSA. I only took the test for reassurance as I had no symptoms.
1. I was surprised when I got the results of the test and my PSA was 11.5 (I'm 62 years so the limit was 4).
2. My doctor gave me a digital rectum test (DRE), but said that he was referring me for a biopsy as my PSA was high.
3. The Urologist did a DRE and said that he was sending me for a MRI scan, but that was only to determine whether I would have a trus or template biopsy.
4. The scan was clear, but the Urologist said that the scan was clear, but he wanted me to have a template biopsy.
5. I had the biopsy and it was clear, I have to go back in 6 months.
Having checked this site, I believe I could not have been treated better. It looks like you are getting similar treatment with the exception that the MRI has been swapped for the ultrasound. I have not investigated the advantages/disadvantages of MRI versus ultrasound, but I had an appointment on Wednesday about a problem I have with my little finger, which a MRI scan had not found anything wrong. During the appointment the doctor gave me an ultrasound, which showed the muscle/tendon was becoming detached from the bone; so I suspect that they both have there uses.
I hope that you understand the above as you said that English is not your first language. I will not tell you "not to worry" as I got told that and it didn't really help. I found that it was the waiting was the worst part so I hope that you get the biopsy and results quickly.
NB. I was please that I had a template biopsy as they take more samples from more areas, so I understand that it is more accurate.