First of all, make sure you are not pregnant again! If you are not pregnant then it may be due to the following reasons. There are many hormonal changes that have probably occurred. First of all directly from the abortion and then indirectly from the stress which it has likely caused. When we are stressed out our bodies secrete cortisol. Cortisol is a fat storing hormone and it tells your body to hold onto abdominal fat especially. I suggest as much relaxation as possible. Take some time for yourself, meditate, do yoga, eat very health, and do some light exercise. You will start feeling better soon. If you feel very upset and stressed out about the abortion and cant move on , you may have Post abortion stress syndrome and should speak with a therapist.