Hello {!name}
Core Stability is crucial before, during and after pregnancy. Your core consists of many muscles and not just abdominals. The abdominal muscles are the internal and external obliques, the rectus abdominus (the six pack) , and the transverse abdominals. There is also the pelvic floor muscles and sacrospinalis, longissimus thoracis, and the diaphragm. Even the gluteus maximus , latissimus dorsi and trapezius play a role in optimal core strength.
A lot of big words but the point...