Joint custody being abused

I was granted a divorce from My wife of 9 years after over a years seperation on Mar. 20th of this year. We had an uncontested divorce and were granted Joint Custody of our three children with the provisions that all visits/decisions would be decided by the two of us..afterwards I was supplied by My wifes Lawyer with a copy of the final decree to sign which was altered from the divorce that was granted..ie, they wanted me to sign papers stating that I would only get My children every other weekend and had worked out a schedule for odd and even years for B-days and holidays right there in the decree...in addition they added a clause for Me to pay half of daycare which was NOT mentioned in court due to the reason that I was supplying childcare during her working hours in the week ...Now I'm a truck driver and am gone from home for 4 days a week and home for 3 each week...My fiancee and her two children relocated here to Oklahoma the first day of July, My children were dropped off at our house the next day by their mother, where they would remain 24/7 until the 1st day of October with the exception of perhaps 15 days periodically during that time when their Mother would appear and visit with the Kids sometimes over night other times for just a few hours at a time...she lives in a different town and school district..the Kids were enrolled by Me here in Our district and attended school here...school issues were addressed by My fiancee and I completely, School supplies, clothes, fees, etc...in addition I was still paying her child support every month and supporting this house hold to...I have documentation and sworn statements from numerous people to these facts...on the friday before the first of Oct she went to their school unbeknownst to Me and checked the Kids out of school and moved them to the other town so that (according to sources) "I can get My child support this way and be able to pay My OTHER bills"...she even went so far as to tell Me afterwards when I asked what was going on " You get to be a Daddy on the weekends only now cause I've changed My mind"...Question: Do I have legitimate cause in a Judge's eyes to petition for custody...this ticks me off and these kids are more than a child support check to Me!!
Also...What are the guidelines on Joint custody in Oklahoma and don't I have any rights in this case or am I just over a barrel?...remember this is JOINT custody alredy granted in court...another factor not mentioned yet...Shes Pregnant and due in 5 weeks...The child doesnt belong to Me or the man shes currently seeing and shes living with another family and my children sleep on the damn couch...said she doesnt intend on returning to work after the birth of her child and that " I shouldnt worry about how she plans on supporting HER family"..

You are getting a good taste of what lies ahead . Some women do not care about you being their daddy the only thing she cares about is the MONEY!!! Youcan take her back to court but your chances of winning are slim to none . Mothers have more rights to children then fathers . i did not make up the court system . As for the other child well that is not your concern she will probably get cs from him as well. I have known women to have babies just for cs . Just like years ago women will have babies for welfare. The law is not strict on women when it comes to contempt but the law is very strict on men who contempts. My advice to you is go to a lawyer (a good one ) and see what you can do . Obvoiusly you can provide a better enviroment for you children . The judge will not look to kindly on her because she grabbed her children out of school and took them to somebody elese house . She does not have a stable enviroment for them . So that will look very good on you and the fact that you continued to pay cs even when you had them . So good luck!!!