面签通过但是持续状态undergoing necessary administrative processing

3月19日在上海梅龙镇进行的H1B面签，过程很顺利被当面告知通过，但是现在已经过去一周状态依然显示
Your visa case is currently undergoing necessary administrative processing. This processing can take several weeks. Please follow any instructions provided by the Consular Officer at the time of your interview. If further information is needed, you will be contacted. If your visa application is approved, it will be processed and mailed/available within two business days.
怀疑会不会是被check了。当时面完离开的时候签证官没有给我什么条子也只收走了护照，求问这种情况是不是被check了，一般情况下还要等多久。