I've been spotting brown discharge for 3 days it was gone for 4 days now i have dark yellow spotting & watery pink discharge my last period was 12 /31?

Anovulation: Most likely a cycle where the ovary fails to let loose an egg. These self-normalize. To be safe, take a home pregnancy test. If it persists, see your doctor.

See your doc: Is pregnancy possible? I assume your periods are usually regular. Other things to consider are hormonal disturbances, female athlete triad, possible infection. Talk to your doctor and get a more complete evaluation.