Board Thread:News and Announcements/@comment-6533159-20151015224111/@comment-24994749-20151019034036

You guys know, if a woman is into intense physical activity before learning she is pregnant (because you don't realise you are pregnant the moment the pregnancy occurs, pregnancy tests only test positive after a minimal of 7 days after the estimated date of ovulation, but if it's an unplanned pregnancy, you will probably not notice until you have missed your period), and continues to do physical activity through the pregnancy, she won't loose shape and the recovery time to get back into action won't be that long.

As for why Raven didn't have an abortion, there is also the possibility abortions for anything other than medical emergencies are not legal in Remnant because with the constant threat of extinction humanity supposedly has always been in, they have some form of "let's get all the births we can" policy.