I am suppose to get my period tomorrow. today i noticed i have clear discharge with blood streaks what could this mean?

You may need to: check for a vaginal infection and check pregnancy test. If there are no other symptoms, such as vaginal itching, odor, etc. then you may be starting irregular spotting/ periods with your hormone cycle. It could be very early on, or minor spotting may be a fluke. But if it continues, you may need to see a GYN or family physician to help you regulate your cycle to be more predictable