Hi Doctor.... I Would Like To Ask U That My

Hi Doctor.... I would like to ask u that my girlfriend had mensulation previous month date 7 to 9 month December....after that we had intercourse..and on 13/01/2017 we check by pregnancy test.the result was only 1 line after 10 min we check again the same test and the result appear with 2line but it was very light line....and again we check today I.e 30/01/2017.and the result appare 2line with dark in colour and she had vomited today....so I want to ask you that how many month had been....please let me know....