My doctor explained to me that he thinks i have lupus but it hasn't fully manifested yet. is that normal?

See below: You could have undifferentiated connective tissue which could explain the above statement that your doctor made. However; if you have not consulted with a rheumatologist, i would recommend that you do so.

Yes: Lupus can evolve over years and become a more obvious diagnosis as time goes on. I personally do not believe in the concept of undifferentiated connective tissue disorder. The majority of these cases eventually turn out to be lupus.