Haih, I can really feel your worry, dear, it is completely understandable to feel anxious going into a second pregnancy after something as serious as this. From what I have generally heard, the outcome for a second pregnancy really depends a lot on the cause of the hydrops, whether it was immune-related (like Rh sensitisation) or non-immune, because each type carries quite different risks and management approaches. Some mums I know of who went through this did go on to have healthy subsequent pregnancies, but they were monitored very closely throughout, with frequent scans and specialist follow-up from early on. Do please work closely with a feto-maternal specialist (a MFM doctor) who can review your specific history, because the guidance truly needs to be personalised to your case, sending you so much strength and prayers, Mama.