I think my cinching suture got broken (left side of my nose only). How is this gonna effect my nose or anything else?

Dear Dores you can not decide it yourself. Please call your doctor and ask help from him/her. Suture breakdown is rare after rhinoplasty because most of the sutures are only placed to keep the cartilages together and none of them have tension. Unless you have a strong trauma to your nose sutures will not break spontaneously. Do not be anxious please.