Yoginimeisje I am not au fait with what drugs are currently available but Premarin short for Pregnant Mares Urine (which is what I was offered all those years ago) involves appalling cruelty:
Peta People for the Ethical Treatment of Animals write that:
750,000 mares are impregnated each year for the sole purpose of collecting their estrogen-rich urine. Tied in small stalls, unable to move either backwards, forwards, or sideways or lie down comfortably, they stand with sacks strapped to their groins for months on end. In order to make the urine more concentrated, their water intake is restricted, so the horses are constantly thirsty. The foals are considered “byproducts,” and most are fattened up, slaughtered, and sold for horsemeat or turned into dog food.
The alternative was Cenestin which is soya and yam based so that was out too.