string like blood which is dark a week before my period

Are you keeping track of your cycle using a calendar or calculator? Are you usually regular, and not very young?

"Stringy" blood (and clumpy blood) is common with my periods. I've pretty much always had it. It looks and feels like... a thin membrane, or something. I don't know. I usually only notice when I shower, though. Also, color and texture of my period, at least for me, can change month by month. One month it may be fire-engine red, another almost a mahogany brown. I think it may have to do with hydration or diet, in my case.

Point is, it's not unusual, if you are on your period. If not, I'd start worrying about possible damage/bleeding of your "lady bits", and, ruling that out, pregnancy at the last. But with limited information, I can't really help that much. If you think you're likely to be pregnant, i.e., unprotected sex, broken condom, etc., then try a pregnancy test. But again, I can't help much with such limited info.

It only happened one day... the next day it appeared much heavier thru the night but that day I notice I wasnt bleeding that much until I urine. When alil Pressure was applied to urine blood poured as if I was urinating.I also notice clots.I then became alil anxious to know what was happening. I don't have an idea if I'm pregnant. My period isn't suppose to start till later oover 5 or 7 days from now...this was not normal at all..

And I keep track using a calendar, usually regular, and I'm 23

huh. Well, sometimes you can start early; it sounds normal to me, especially with how you said you didn't notice until you urinated. If my period is very thick and "clumpy" one month, sometimes it takes a shower or urination to get started. I wouldn't worry, personally.