Discharge

I'm 14 + weeks pregnant with 3rd child and have a lot of mucus when wiping at times. My family dr said I had bv on 3-17 and I was treated. Still had discharge when I went to OB a few weeks ago. Was checked for bv and told I didn't have it. Told it's normal to have increased vaginal discharge. But sometimes it's green. No pain, irritation or smell. My ob wasn't concerned about it but I read bv can cause premature labor and I'm afraid it never really cleared. Anybody else have this problem?