Drain fluid is still dark red one week after Breast Implant Revision surgery with Strattice. Is this a cause for concern?

I had breast implant revision surgery with strattice a week ago. The PS placed a drain for the left side. I was told that the fluid in the drain should turn yellowish clear in a few days. But mine is still dark red after a week, although the output of the drain has gone down to below 20cc per day for the past three days. Is this a cause for concern? Should the drain to removed soon?