In my school, embryology is self-study, pass/fail. It's a 40 page syllabus and easily crammable in 5 hours.
Then I bought the HY Embryology book and was like "HOLY ****." I'd assume embryology is not a "trash topic" on Step I and I will actually make my way through this book. So if your school is teaching you a lot of embryo, I don't know whether you should feel good or bad.