I am nervous about my blood test later today.
Why are you getting a blood test.
To see how much silicone is in my blood.
It's fair to be concerned about your health, and nervous about upcoming medical tests. It's good that you're getting bloodwork done though, because it can help detect any potential issues that you might have.
I just want to know if I have silicone in my veins since it's better to know than not know.
I doubt you would have any silicone in there. Do you inject for aesthetics?  That could be pretty dangerous if you have no way to get it out.