https://www.nextsource.com/2015/05/14/the-laws-of-pregnancy-and-contractual-labor/
你自己看这篇文章,就知道你没有说清楚很多事实。
On appeal, the court found that only the primary employer, (Perma-Temp) was responsible for compliance with leave according to the FMLA. Yet, the court ruled that the secondary employer (Keppel) did bear a conditional burden. The secondary employer was obligated to accept a returning FMLA employee, provided they continued to engage the same staffing firm to fill that position. In this case, since the secondary employer replaced Cuellar without using Perma-Temp to fill the position, neither entity was found to have broken their FMLA obligations.
也就是说,你的孕妇身份主要是你的直接雇主(小老板)保护。在你的产假期间,你的合同雇主(大老板)可以用别的合同公司的人来替代你的合同。
但是如果你的合同雇主(大老板)用你的直接雇主(小老板)的其他人来代替你的合同,而且如果你的直接雇主(小老板)执意把你送回原职位,你的合同雇主(大老板)必须接受你回去。