How to me more secure?

#SheWon
In Nov 2016 I lost my son at 15 weeks gestation. I am now blessed to be pregnant with my rainbow baby. Now at 11 weeks i have these anxiety attacks not knowing if he's ok in there. Do any ladies have any tips or ways to know everything is ok? It was so sudden last time his heart just stopped so I don't even know what signs to look for? Any advice would be appreciated