I fell from a 2 story window onto concrete and my left knee is swollen from is the middle of my thigh all the way down to the middle of my shin and it's oozing . Like a softball and it's black. Is there anything life threatening I have to worry ab.

Have you considered seeking medical attention? We can't tell you across the internet what is wrong with your knee.

Have you considered seeking medical attention? We can't tell you across the internet what is wrong with your knee.
Is really bad I just want to know if I can get a blood clot or not

Yeah, maybe you can. Do you really want to take a chance like that with your knee? See a doctor before something bad happens.

If it's oozing and swollen that much, get yourself to an ER!! You could be in a wheelchair or using a cane for the rest of your life, depending on what is going on inside your leg.

So Should I go tonight then to the ER or wait till tomorrow.

If you fell two stories on this knee, your leg may be three times its normal size by morning.

YES, go to the ER!!