Trace Blood on Dipstick? But never in morning.

[ScaredOfDisease]

So as you can tell by my name, I'm kind of a hypochondriac. I had some dipsticks I got online. Mainly to see if I urinated any protein after taking whey protein. I never get any protein in my urine. However, I noticed that I sometimes get trace blood in my urine. Never more than trace. Sometimes I can go a whole day or 2 without it. Or sometimes it will come and go in the afternoon or evening. However, it never ever shows up in my first urination of the day. I was taking an ibuprofen each night due to a back condition. But I stopped now out of fear. I do go to the gym, and it seems to happen more on gym days. But I don't run or do a lot of impact training. Just lift weights. We went away recently, and did a lot of up and downhill walking, and it was showing up pretty often then as well. But never in the morning. If this was something bad, wouldn't it show up at least some mornings? Really don't want to have the tests they do done on me. No blood is visible. No symptoms. Just find it strange how my first urination of the day, which is most concentrated, never shows any blood. Anyone able to help? Thank you!