Can you help me me and lilsis are both pregnant?

i'm 16 and 5 months pregnant my lil sister is 12 and 3 months pregnant and i just found out today that she is pregnant i yelled at her neither one of us can go to my parents an tell them we are pregnant because of our stepmom she asked me to take her to the doctor and i asked her why and she told me and i got mad because she made the same mistake i did should i be mad the daddy of her baby is 26 and my baby's daddy is almost 20 mom and dad don't know she was dating a 26 year old i had met the 26 year old when they got together he told me he was 17 but she knew he was 26 i had plainly told them both do not have or he would have to go through me so me and my lil sis drove to his house and me and him started fighting and he shoved me and i punched him and i got a real sharp pain should i be mad at my sister for dating him and getting pregnant by him when she is the only person who knows i'm pregnent and i am the only person who knows about her pregnancy ploease no long answers