hi ! there is no days or weeks limit to meet a gynaecologist when you are pregnant, if this is your 1st pregnancy, you should meet gynaecologist as early as possible, so that it becomes easy for the doctor to detect any abnormal conditions that you may be facing in the antenatal checkup which helps for proper progress, if its your 2nd or next pregnancies, you may plan to visit at or before 8 weeks if you have no marked abnormal symptoms like passive bleeding etc.