No mate you should be deep enough for that not to happen.does any of the test come back out with the blood when it squirts out? Pulled pin out and squirted about 8inch away lol.
I go at least an inch in then aspirate if there's blood take it out if not inject. Should all come out and disperse. If any blood come as your taking it out it shouldn't affect the test.
I'm only giving my experience someone else may have a different take on it but mines always been like that.