Prayers, Prayers, Prayers Please

My brother-in-law and sister-in-law (who are our best friends) have been trying to have a baby for three years. After a round of in-vitro, they are pregnant with twins. She is now 22 weeks and is being admitted into the hospital for pre-term labor. This is the short story. We are headed there right now to be with them. Should know more by Saturday, but please keep them in your prayers. We need the drugs to work by Saturday so that they can possibly to a procedure to stop the labor long term. As you can imagine, this is extremely difficult for them. We truly COVET your prayers. Will update soon! Thanks