Should I be worried if I have cramps, back pain, and bleeding bright and brown on my tp when I wipe?

Any time there's bleeding during pregnancy you should consult your doctor. Bleeding can be normal for some women, but it does need to be monitored. Bleeding, especially bright red bleeding, and cramps is worrisome, and you need to see your doctor to discuss this.

So yes, you should worry enough to see your OBGYN.