We are HIV+ but he won't zip up his trousers

Photo; Courtesy

I have been married for four years and everything was moving on well until about six months ago when I tested HIV+. I immediately told my husband and he tested positive too. We agreed to keep this between us and try to live positively and did not tell anyone including my younger sister who is living with us. About a month ago she became sickly and after taking several tests we confirmed she was pregnant. She became hysterical and said that my husband was responsible for the pregnancy. Now I cannot comprehend how he would do this to her. I had always thought that she would be the one to take care of my children should I die of the disease. I am really frustrated now and I keep having suicidal thoughts. I don’t know what to do. I need your help, please advice...{Sophie}