Unusual color of my semen followed with slight pain in testicles

Don't worry, you sound perfectly normal. All men and boys' sperm and semen is variable and can be different looking over time for many reasons, like how recently you ejaculated, water intake, foods, and level of excitement when you shoot. The more recently or often you shoot, the more likely your semen will be less thick and white, just until your body makes more semen to refill your testicles and glands again for more sex. Slight pain from the enlargement of your testicles and penis during and right after arousal and ejaculation is normal and called blue balls if you don't get to ejaculate and relieve the pent up pressure from getting close and not shooting to relieve the pressure. The muscles can sometimes simply ache a little after ejaculation just like any muscles after use. It sounds like you have nothing to worry about unless the pain is sudden and great pain that won't go away in an hour or so. .