What you're describing is called vaginal discharge. It's completely normal, because the body produces it in order to keep the vagina moist, lubricated, clean and free from infection. Being a virgin or not doesn't have any effect on the discharge.
It's also totally normal for the discharge to be different at different parts of the menstrual cycle. Obviously, the monthly menstrual flow consists of blood, hence why it's red, and the white discharge is to keep yourself clean 'down below'. While you're ovulating, a clear, thick, slippery discharge is created, similar to raw egg white. This is in order to make it easier for sperm to potentially reach and fertilize an egg, resulting in a pregnancy.
If the discharge is causing discomfort in your underwear, I recommend that you wear a fresh pantyliner daily. A pantyliner is like a miniature version of a sanitary towel without wings which is stuck in your underwear to absorb natural discharge and trap any wetness, so that any odor won't develop. I would recommend that you try the always or bodyform ones. I find that they work well and are a decent price, especially if you can get them in discount shops like Home Bargains or B&M.
The only time it's a cause for concern and which warrants a doctor's appointment is if you experience any of the following:-
- you get much heavier discharge than normal, meaning it's soaking through a pantyliner in less than a full day
- it's clumpy, like cottage cheese (this indicates that you have a yeast infection)
- the discharge caused itching, a burning sensation (especially when urinating), redness or irritation to the genitals (this indicates a yeast infection or STD)
- it contains blood other than during your period.
- it has a foul odor (indicates an infection)
Hope this helps.