Is it normal to have a yellowish stain on my panties all the time? no itch no vaginal smell no discharge tests normal. is that a normal thing?

It depends: Vaginal discharge will change throughout the menstrual cycle and can be a normal sign of the hormonal changes of pregnancy. On the other hand, vaginal odor can be a sign of bacterial vaginosis. Vaginal itching can be a sign of a yeast infection. Sometimes vaginal discharge can be a sign of a sexual transmitted infection. It is a good idea to get checked out.