Are you ttc in secret or does everyone know??

The hubs and I have been ttc for awhile now but we haven't told anyone and if we do get pregnant we are planning to wait until almost 12 weeks to reveal (when threat of miscarriage is lower). Mostly everyone that we know thinks we are anti kids. We have been together 8 years and we love to travel, buy a house, just be together. But now we are ready for a baby. Is it common to conceal the "baby making" news? Or do people usually know? Just curious on what others have done/ are doing.