Girls hello! The situation is such that I arrived from Vladivostok to …

Girls hello! The situation is such that I arrived from Vladivostok to Siberia for 1.5-2 months to visit, on the road I learned that I was pregnant, did a test, (already in Siberia upon arrival a week ago I found out it was 4 weeks old at an ultrasound, at the moment it's already the fifth week) the question is: where should I register? In another city (not at home), register in another city, then after half a month pick up the documents and register again at home or wait until returning home and register there? Who has been in such a situation or who knows, please tell me ?