The brown spots you saw are considered
ketamim (stains) as opposed to an actual flow which would automatically render you
niddah.
Stains found on the
bathtub may be disregarded and do not render you
niddah as long as you did not actually see the stains exit your body. The stain on your leg may have rendered you
niddah depending on the
size and color of the stain. If there was less than a
k'gris (the size of a US dime or Israeli shekel) it may be disregarded. Note that stains on the skin are measured cumulatively – if several small stains would add up to a
k'gris, the stain is problematic. On other surfaces, each stain is measured individually.
Stains larger than a
k'gris are evaluated by the
shade of blood. If the brown stain was the same shade as the brown on your
bedikah which was ruled acceptable, you may disregard the stain. If it was light brown (the color of coffee with milk) with
no reddish hue, it may be disregarded as well. If it was a brown shade with a reddish hue you should assume it rendered you
niddah.
If you are unsure about the size or shade of the stain, and you no longer have it to bring it for
evaluation (i.e., you didn't transfer the stain from your skin to a white cloth), there is room for leniency to disregard the stain since it was found externally, and you were
tehorah at the time.
Please see
here regarding the observance of
onot while using hormonal contraception and get back to us with any further questions.
