Trying again after a chemical pregnancy.

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My OB thinks I was closer to 7-8 weeks based on HCG level, but I think I wasnt that far along based on possible conception dates. Either way, we lost our baby. Now that we're ready to try again, I'm curious if any of you felt guilty, like you were 'replacing' the baby you lost. Also, this will technically be my rainbow baby, but no one knew we were pregnant. We don't announce until 12 weeks. How do I mention it without having to constantly explain and relive our lost baby to everyone? Do I just not celebrate this baby as a rainbow publicly?