Thinking about getting my tubes untied

I tied my tubes because I was with my ex boyfriend of 8 years. We have 3 kids together and I didn't want any more from him. He is very abusive and was not what I or anyone would call father material.I thought I was going to be with him forever, actually I thought that I was stuck forever, so I got fixed. Well we split up after I put him in jail for blacking my daughters eye and now I have married someone else and he is just everything a women could want. He has one 5 year old son and maybe a 14 year old daughter (long story). He and I would love to have one or two more children. I am afraid that I will not be able to have more children if I do go in to see if they are even untieable. I would love to give him a child but I am scared that they are going to tell me that they can't put them back together again.Then if I do get put back together then there is the possiblity that I could heal up to where I still can't have any kids. That is not all I am stressing about it cost a pretty penny to have the procedure reversed and my husband spends money like no other. We have talked about other opions and we have agreed on a few if I can't have a baby. I want to be able to let him experiance the birth and be there because he was deprived of that with both his children(long story). But any ways I guess thats all for now.