A Goodreads user asked:

I still have a few pages to go and I haven't completed the series either, but I am perplexed (technical question follows with some spoiler): didn't Claire have an IUD, albeit expired, in place? As far as I know, it's very unlikely to have a successful birth that way. Is this detail dealed with later?

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Sandra IUD has an expiration date. She removed it and didn't replace it.

Elena I assumed that they had removed this while she was in jail ...
she had the IUD while married to Tony...

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