2 Days Ago, I Had Blood In My Urine When

2 days ago, I had blood in my urine when I peed 4 different times that day. That was the first time I remember ever seeing bloody urine. The next day, my urine was normal again. I also have a very slight dull ache( comes and goes ) on the left side of my groin by my left testicle. I am 51 and am in pretty good shape. I am seeing my doctor this Tues. Thanks.

Sam