It could be a continued pregnancy with is very possible with a medical abortion. If you had a surgical abortion you should be fine, because the doctor will physically see the pregnancy pass. But if you had a medical abortion where they have you take the pills at home that induce a miscarriage then you may want to go to the doctor and they can do an ultrasound to see if there is still a pregnancy. It could just be that your hormones are still a little crazy right now too. Just keep your doctor informed, they will know what to do, and what is normal! Good Luck!