I had sex on Thursday and I probably masturbated three time after that. Now on Monday I noticed a white fluid comes out my penis after peeing and I'm not sure wat it is. Please help me.
The most likely answer is that you picked up a sexually transmitted disease. Go to a doctor immediately have yourself checked. Even if the symptoms disappear, you still need to be checked. Don't delay. The sooner you have this treated the less damage the disease will do to your body.
"Whoever commits adultery with a woman lacks understanding; he who does so destroys his own soul. Wounds and dishonor he will get, and his reproach will not be wiped away" (Proverbs 6:32-33).
This one of many reasons why sex outside of marriage is sinful.