my doctor experience, it could be several things. First of all, it could be normal, just depends on whether it is before or after you ovulate (Taking Charge of Your Fertility is a great book to help you figure that out). Ovulating occurs in a textbook (which isn't necessarily what happens in real life) 14 days after you start your period. Before you ovulate, the discharge is more likely to be okay. After you ovulate, probably not good. Normal ovulation fluid has the consistency of egg whites right before you ovulate generally, and it'll stretch between your fingers and not dry out.
The second thing it could be is a yeast infection, but that usually has just white discharge that smells like vinegar, and you itch like crazy. You'll generally get really itchy right before your period and possibly at night, but then the itch etc, will go away during and slightly after your period.
The third thing it could be is a bacterial infection (not an STD) and you can get that for almost any reason. Your vagina might not smell fishy, but you can still have a bacterial infection. The natural bacteria might have gotten out of hand. Many women (this is from my doctor and my reading) have bacterial infections and they have no idea. It doesn't smell that bad or anything. The smell and the discharge will get worse during your period.
Hope this helps! If you are worried though, I would suggest going to your doctor 'cause they can do a culture and tell you for sure.....if not......research your syptoms online...it helps...
..........good luck and hoping for the best...=)
nurse at a hospital with a 18 year old daughter