I got married a few months ago and recently started taking birth control. This will be my first time going to the mikvah while taking it. My hefsek taharah was clean, but this morning (day 5 of my shiva nekiim) my bedikah had a few brownish marks and pieces on it. This has never happened before and I won’t be able to ask my rabbi until later tonight and would like to know if this could be a problem?
This is not something that can be answered over the internet, as it is something that can only be determined by the Rov that actually looks at it and makes a determination.