Unfortunately, the blood found on your finger did render you
niddah. It is comparable to a
bedikah in which even a small amount of blood is problematic (even less than a
gris).
You should complete the
minimum wait before performing a
hefsek taharah and starting the
seven clean days.
For the future, if you find a questionable stain on
toilet paper (after waiting between urinating and wiping) you can wipe again to check if there is any more staining but you should
not check internally.
Please feel free to get back to us with any further questions.
B’hatzlacha!
