Still bleeding 1 month after Abortion.

My girlfriend got a surgical abortion at planned parenthood exactly 1 month from yesterday. Last Sunday she started spotting, not heavy bleeding but spotting, red blood, which we were told is bad. She went for the follow up and they said she was fully healed, but don't know why she is bleeding. She's showing none of the signs associated with tissue remaining (doesn't feel pregnant, no cramping) they did a blood test on Friday and were still waiting for the results from that. They also recommended a sonogram but since her parents don't know we can't go through insurance and a sonogram is quite expensive. Basically all we want to know is is this spotting normal? She was very active and took no time to recover after the surgery and went right back to her daily routine.