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You do not need to worry, as the bleeding will be more than normal and more painful. This is because you have artificially created the inner lining of the uterus, which has started to bleed. It will stop on its own, and it will not affect her health or future pregnancy chances. If she has too much weakness, let her have lots of water, juices, ORS (oral rehydration salt), sweets, fruits, high-protein diet, etc. She can try taking painkillers like tablet Hyocimax (Hyoscine) or Cyclopam (combination of Dicyclomine and Paracetamol) or Spasmo Proxyvon (combination of Dicyclomine, Paracetamol, and Dextropropoxyphene), 2 to 3 times a day until the pain subsides. If bleeding is of concern, then she can try tablet Trapic 650 mg or Pause or Tranostat 500 mg (Tranexamic acid), 2 to 4 times a day until bleeding reduces. These are not hormones, but it will control the bleeding. She will mostly bleed for 3 to 5 days, but the heavy bleeding will stop in a day or two.