I was never married to my ex, but we had a child together. While I was pregnant he never wanted me there and kicked me and the baby out when she was 6 weeks old. He didn't talk to us until she was ten months old. He decided then that he wanted something to do with her, after I filed for support from him. I finally found out that he had a girlfriend since I was seven months pregnant. He was still dating her while we were supposed to be working things out. He also went to rehab while our daughter was three months old. His girlfriend was doing the drugs with him. He just got allowed to have her every other weekend. He said his girlfriend wouldn't be there, because I asked her not to. He lied, and she was over at his apartment last weekend. I feel that my daughter is in danger when she is with them. What can I do, and am I able to open our case back up and keep her from going there this weekend because I feel that she is in danger. He brought her back last weekend with her pants soaked in urine because her diaper was so full. What do I do? I know I need to see a lawyer again, but can I open the case and keep her from going?

You could write down and keep track of ALL your concerns, show the Judge and ask for supervised visits.

Start a journal and write down everything that happens during visitation, whether it be good or bad.
Definitely get a new attorney and go back to court if you think your child is in an unsafe environment while with the father.
Anytime you feel something may be putting your child in danger you have the right to get it settled in court.
Visitation orders can be changed, a judge just need to do this. And you will have to specify about you not wanting the girlfriend around and convince the judge. Because it will need to be stated in the court papers.