I don't see anything wrong with it. Pre-natal screenings start happening at 3 months, which is about 13 weeks. And further pre-natal screening happens during week 15-20, which is more than enough time to find out if your child has a defect and you can choose to abort or not abort during that time.
what defects would be bad enough that warrant an abortion?
Edwards' syndrome and Down syndrome, with the most common being Down syndrome as the reason for terminating a pregnancy.