If there is no odour to it other then a normal smell I would consider it normal.
Have you had sex recently? I only ask because the times I've had something a bit different has usually been after having sex. Maybe it was ? Some form of left overs.
Maybe that's a normal pregnancy sign for you and when you test in a week you will be pregnant. I know for me my first sign is the runs which lasts for weeks. That's what has given it away for me with my last 2 pregnancies anyway.