I have recently been diagnosed with HSP (Henoch-Schonlein Purpura), doctors are worried my kidneys might be at risk, need second opinion?

So I’m a 15 year old girl and have recently been diagnosed with HSP (Henoch-Schonlein Purpura). I’ve had it for about 4 weeks, but a much milder version of what I have now. During the first two weeks, i experienced terrible back and stomach pain, frequent urination, and fluid retention in my stomach. In the third week, i experienced vomiting, malaise, blood in my stool and much more severe back and stomach pain and bloating, however the rash subsided. In this fourth week, I was feeling much better and waxed my legs, which caused the rash to flare up much more severely, and i experienced terrible arthritis and frequent urination. I was taken to the hospital and given a urine test, in which they found that I had high amounts of blood and protein in it. The doctors are worried my kidneys might be at risk, and i was just wondering, do my kidneys sound affected and if so, with the absence of a lot of the symptoms of kidney impairment in this fourth week and the prominent appearance of them previously, could my kidneys have been impaired then repaired themselves on their own this week? But if they haven’t, what happens if my kidneys are infected or leaking?