It was and wasn't a baby to me. I think it's contradictory thing really and I think given your two posts, you might have felt the same.
Biologically, it was a maybe baby that never got there. (Because it was a sac and nothing else). That helped me deal with the mc to an extent especially because what I passed wasn't a tiny formed anything.
I didn't get the chance to get that excited as I spotted after a week of knowing I was pregnant so it was all worry. I had the shock (even though planned) of the BFP and then a week later, it was all in doubt.
But emotionally, to me, I have lost a baby. Whatever the biological thing was, to me, in my heart, it was my baby. I have howled for it. I gave up drinking for it. It made me nauseous. I sang and spoke to it, mainly once we had been told it was small, we spent two weeks shouting GET BIG BABY at it.
I also have faith in my body now, it tried it's best to hold onto it and it sent me the messages that I was pregnant so I'd behave as if I was and protect my baby. I also have faith in my mind, I am listening to how I feel and seeking support. I have faith in my heart that I have capacity to love and be a mum.
I also deep down knew this wouldn't work out. That's not woo about the baby though, my life just tends not to go smoothly compared to other people's.
I probably won't keep it a secret though. I hated doing that. I only told a few people and it was only because of the problems so I only got to tell my sister. I'M PREGNANT!!!! Anyone else, I told them but it was a 'I'm pregnant but there are problems so I'm told to expect the worst'. I wished I'd told more people because my miscarriage is public knowledge anyway.