I'm 7 weeks 5 days and have been bleeding for 12 days none stop somedays more than others. had ultrasound done and baby seems ok should i worry?

Ask MFM. Repeat soon: It is certainly reassuring that your 7 week embryo "seems ok" despite your persistent 12 days of non-stop bleeding the cause of which has not been explained to you. It would seem best to have another pregnancy ultrasound performed by a skilled certified sonographer and to seek an evaluation and pelvic exam, Pap test etc...by a Materno-Fetal-Medicine specialist who can answer your question.