我要去墨西哥签证了（签H-1B），我是最初签B-1过来的，5年前在德州El Paseo那里签了一个F-1，还回了国。现在要去Tijuana签H-1(这月底), Appointment 都约好了，突然在约Appointment的网站上（www.visa-usa.com.mx）发现一个大问题，实在是看不懂，又害怕。
网站上说：
Who Can Apply in Mexico：
Applications for visas that reflect a change of status (e.g., F1 to H1B or F1 to J) if the applicant has the original change of status notice (I-797) from DHS and the applicant originally entered the US in other than B status.
Applications for those with a B visa issued in their home country that includes an annotation indicating they are entering the US with an intent to change visa status, such as "Prospective Student".
Who Cannot Apply in Mexico:
Applicants who entered the US with a B visa issued in their home country that changed status to another visa category, e.g., F, J, H1B, but the visa did not have an annotation indicating intent to change visa status.
我有每月的pay-check copy，和original change of status notice (I-797)，也真的是在工作。但是我可是 “Originally entered the us with a B visa”, 尤其是“who cannot apply in Mexico”, 真是看不明白。 但是我又重新签过F-1来美国，我能去Tijuana签H-1吗？
紧急求助，万分感激。
Who Can Apply in MexicoWho Cannot Apply in Mexico