这个月去看LG,所以找医生开了避孕药。哪知道回来之后就来月经了，药片还有4天的没吃呢。也不知道怎么回事。有没有懂这方面的，给点意见吧。多谢先！

吃避孕药有不让例假来的作用吗？

不是应该吃完之后才来的么？

Could be "breakthrough blooding", tell your doctor about it.

Some people has reaction to BCP when they start to take them. It might dissapear after a few mons' usage, or switch to a different brand

多谢多谢！

The first time take them, normal. Some people took about 2-3 month to get to normal.

it depends on how many tablets you get. there is some birth controls has 28 pills and the last 7 are placebo which contains no medicine. they have those 7 inactive pills so you take it every day .