排期一下子前进了，由于我化学专业，生宝宝就暂时没有工作，现怀孕。有两个问题
1。niw对于同一领域工作的要求要地有多严格，如果我140中是有机合成，现在如果找到一个biochem 的 postdoc instrumental job，有一点合成，但不是很“有机”要不要紧，会rfe么？同一领域，有机化学跟生化算不算？
-Hard to say. You need to check whether your new job responsibilities/job classfication code is in the same as that of the old job.
2。排期下个月就到了，我又多长时间的期限递交485？
-You do not have to file the I-485 if you do not want to. You can file it any time as long as the 排期 does not retreat (turn back).
过多久不递交我的原来批准的140失效呢？
-No time limit. Your NIW I-140 is always valid.
