It indeed would have been best to bring your
bedikah to a rav for
evaluation. Not all browns invalidate a bedikah!
Although it is possible to assess a
bedikah when dry, a
bedikah that comes out of the body translucent is generally considered acceptable, even though colors sometimes darken over time. The exceptions would be if you were unsure about how clearly you saw the
bedikah at first or if it changed into a color that was red or reddish, in which case a rabbinic evaluation would be in order.
As such, if you are confident that the
bedikah was initially translucent, and it changed into a light brown or beige with no reddish tinge, it is acceptable and your
clean days continue. In this case, the
bedikah you performed yesterday would count for that day.
If the brown on your
bedikah was darker than a beige or had a reddish tinge, please contact us or your local rabbi with a more detailed description and with any other factors that might be relevant (e.g., your fertility or marital situation). Make sure to do a
bedikah today before sunset. If the
bedikah from yesterday is ruled unacceptable, the
bedikah you performed today will count as your new
hefsek taharah, and tomorrow will be the first of your clean days.