Negative pregnant test, had spotting & clearish bloody discharge, sharp throbbing pain near right ovary what could this be?

?Ovulation. Possible ovulation-immediatly prior to ovulation there is clear cervical mucus; a sudden surge and immediate decraese in estrogen levels is a precursor of the lh surge which trigers ovulation. The spike in estrogen creates a brief episode of spotting which admixed with the remaining clear mucus creates the above type of discharge and the popping of the follicle gives a transient pain sensation.