Oomis, I don’t know you and what you went through, but “spar[ing] them from pain” is only a valid rationale if all things considered they wouldn’t want to know. Most times I have heard people use that excuse it is to spare their own discomfort.
Bottom line: the fact that you are pregnant is good news. Withholding good news is selfish without a good reason. Most reasons I’ve heard both here and generally are not good reasons. Share it happily (to those that’d be made happy)! And if c”v there’s a miscarriage, you’ll have support. There’s nothing wrong with that!