retained placenta

Charmaine
Hi
I'm 7 weeks postpartum but still been bleeding.
 
I had a ultrasound today and the doctor said I had retained placenta but was about a cm, she didn't offer me a d&c she just said it will pass on it's own?!?
Will it cause me any problems or long term?
Is there anything I can do or take to speed this up? 
I'd like to resume my life. Xx