Pregnant after losing my child at 13 months

I recently found out I’m pregnant and I’m having mixed emotions

My 13 month old son passed exactly a month after his first birthday

Without getting sick or long term problems

He was the happiest , most handsome n intelligent little lad that everyone was just crazy about. I’ve accepted his passing as God’s will and I’ve never questioned why him. He was his Father’s joy and his Grannies most loved

I know his father will be happy to know I’m pregnant again and the grand parents too but I dnt know how to tell them n I dnt know how long I will be able to keep it a secret. After the loss my family endured its hard for me to get excited pls advice