Step 1: Understanding the Concept.
First work out what a secretory endometrium tells us about this patient's cycle, then match the treatment to that specific situation.
Step 2: Key Formula or Approach.
A secretory endometrium means ovulation has already happened and progesterone has acted on the lining. So this is ovulatory DUB, different from the more common anovulatory DUB where the lining stays proliferative. Each type needs its own treatment.
Step 3: Detailed Explanation.
Combined oral contraceptives are built for anovulatory DUB, where estrogen keeps building the lining without progesterone ever balancing it. That is not this patient's picture, since her lining is already secretory.
In ovulatory DUB with a secretory pattern, the corpus luteum often does not support the lining well or for long enough, so the endometrium breaks down in a patchy, drawn out way instead of a clean single bleed. Progestins fill in this missing support, letting the lining shed together in one proper cycle, which is exactly why they are the initial choice here.
NSAIDs help lower prostaglandins and reduce blood flow, and they can be added on, but they do not correct the underlying progesterone support issue that this secretory pattern points to.
Danazol is a stronger, more side effect heavy drug kept for bleeding that does not settle with the simpler hormone options.
Step 4: Final Answer.
The best initial choice for DUB with a secretory endometrium is progestins.