I ve been on lo estrin 24 fe for a few months, after switching from mini pill to lo estrin. Was going ok but getting bleeding randomly and that last a couple weeks and may stop and restart. The blood is dark (brownish to almost black) and gooey (thick) not really like normal period. Thought I was done bleeding but keeps coming Back and very often. I don t always take perfectly on time but I do for most part. Is this pill not strong enough? Do I need to wait longer and see??