Periods are 2 months late and clear discharge is coming out with red sticky stains. I did blood/ urine test both negative. What could it be?

Infection. This type of vaginal discharge could indicate infections. I recommend visiting your ob/gyn or family physician to receive vaginal and cervical cultures for infection. Vaginal infections are easily treated, but if left untreated could lead to pelvic inflammatory disease (pid). At it's extreme, untreated pid can lead to increased risk for pelvic abcess, tubal pregnancy, and infertiltiy.