How do y’all feel about this..

Staying the weekend with your boyfriend at his moms.. his mom is okay with it . I’m 20 don’t live with my parents but I told them where I would be staying so they wouldn’t be looking for me & they said his mom should be ashamed of herself to let me stay and we’re not married and since I’m already having his child I don’t need to lower my standards further and I look cheap . And it’s slack .. Is it wrong for me to stay with him at his parents house even tho they are okay with it or my parents or doing way too much ? Also I don’t really like the choice of words she used