Woke up this morning with blood on front side of underwear could not find where come from any ideas? i know i got to go to doctor!!

Urethritis: Would be the most likely cause. You are right, you need a quick exam by a physician. In the absence of external ulcers, blisters, or bleeding skin lesions, the blood probably is from the urethra (opening at the tip of the penis). A urinalysis to look for infection, and possibly testing for causes of urethritis should be done IF symptoms persist.