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Q我怀孕2个月了,之前皮肤就不太好,皮炎经常发作,常用达克宁。现在是怀孕期间,还能用达克宁吗?A妊娠孕周的计算是依据末次月经时间,但真正的孕龄则是按照受精日期。在受精2周内,胚胎细胞分裂活跃,在此期间如果接触到致畸物质,如果大部分细胞受损,就会发生流产,如果少部分细胞受损,胚胎可以完全修复,这就是所谓的“全或无”效应,而在受精后2~9周期间,是胎儿各器官形成阶段,也
Q I was 2 months pregnant, before the skin is not very good, dermatitis often attack, commonly used merkin. Is it possible to use metronidazole during pregnancy? A Pregnancy gestational age is calculated on the basis of the last menstrual period, but the true gestational age is based on the fertilization date. During 2 weeks after fertilization, the embryonic cell divides actively. During this period, if teratogenic substances are exposed, abortion will occur if most of the cells are damaged. If a small number of cells are damaged, the embryo can be completely repaired, which is called “ ”All or no " effect, and 2 to 9 weeks after fertilization, the formation of fetal organs stage, also