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Twins pet only needs to be equipped to the female dwell at the time that the baby icon appears.
Neither care about conception or anything between then and when the baby icon appears.
You can freely breed as many babies as you want with no pets equipped then equip the + special pet before clicking to give birth, Just be careful to click low on the dweller's body to target her to avoid accidentally clicking the baby icon before you're ready. If you're really worried, you can use the dweller list to target her instead of clicking directly on her. You might have to use her room's dweller list to see exactly what her name is to find her in the looong vault wide dweller list that lets you target.
You can also equip a twins pet to your pregnant dweller any time before the baby icon appears then, after the icon appears and she's ready to give birth, switch out the twins pet for a + special pet to give birth to twins, both with the boosted special stats.
Well, that's an interesting trick! Wouldn't have tried this if you hadn't mentioned it here. Hmm...