Princess Grace suffered a miscarriage, I remember the bulletin coming on tv. To my knowledge HSH didn't talk about it or she may have and I missed it over the years.
Louis and Tessy of Luxembourg experienced a miscarriage and we only learned of it about 2-3 yr. ago when Tessy spoke or wrote about it occurring. I remember seeing the couple at one time and Tessy was visibly pregnant and she appeared to be around 4+ months. The Grand Ducal House never issued any pregnancy announcement and I thought I had really been mistaken until Tessy's later interview.