Scared to tell my SO

I'm pregnant again after 3 losses. First was ectopic and then exactly a year after that i miscarried. Then 6 mos later another miscarriage. It has now been almost 16 mos since my last miscarriage and here I am, pregnant. But am afraid to tell my SO. It upsets him so when it doesn't stick and I just don't want him to go through that, has anyone else waited to tell your SO? How long did you wait?