IVF Treatment!!!!

My name is Alicia. I am engaged to Travis. I have 2 teenage boys that are 13 and 15. My husband passed away 3 years ago and since being with Travis, who doesn't have any children I have decided I would love to have another baby. When I was in my 20's I had my 2nd child. During the process of filling out and signing paperwork while on medication. Waiting to go back to have my c section my mother decided for me that I was to have my tubes tied during the surgery. I wasn't aware of the papers I was signing because I was on medication. I did not know that I had my tubes tied until my son was 4 months old. I think that decision was taken from me and I am now in a position in life where I want another child. Please help me get this done.