Yeeeeah. Uh. >>; So Ana gets an accidental pregnancy because Hellspawn refuses to wear condoms and puts birth control entirely on her. And I believe that she ended up slipping in taking her pills because of stressful events, so...

(You know. Because birth control pills work exactly the same way for everyone...)

So Hellspawn gets really, really angry at her, and they end up getting married at the end of the third book because... because.