I have my period but nothing comes out no blood just white/black liquid what does that mean?

Pregnant? White, mild discharge from the vagina is usually normal and due to hormones. Sometimes old blood can appear dark brown as it is exposed to the air. If your most recent period was lighter or shorter than usual, it is possible you are pregnant and it was not a true period. It might be a good idea to visit a doctor or take a home pregnancy test.