I am working in Germany for 4 months with national visa and currently in process of applying for an EU Blue card. Unfortunately I got an appointment only in December 1st week of 2018 and my national visa expires on last week of November, 2018. The Ausländeramt said there are not earlier available appointments. I was wondering the consequences of this as there would be around 15 days where I would be without a valid visa.
P.S. I visited the local Ausländeramt 4 times, and every time I was asked to email for an appointment, and every time I emailed them, I got no reply and I got an appointment on my 4th email to them. They have been extremely busy but I am quite uncomfortable with the fact that I will be without a valid stay/travel document in Germany for 15 days.
UPDATE- I talked to HR representative from my company and they helped me get an appointment at the Immigration office for Fiktionsbescheinigung, which is basically a temporary work permit. So anyone with the same situation I was in, please do talk to Ausländeramt regarding Fiktionsbecheinigung or also extending the type D visa, which I think can be done. Thank you!