Double line

I set an appt w my gynae when I was week 5 nearing to week 6 (few days after I found out I was pregnant). I could see the yolk sac w embryo and also flickering of the embryo on the screen which is the indication of heartbeat. but it may be too early for some so best time to go at around week 7 to 8. then my 2nd appt was 2 weeks apart and then 3rd appt onwards is 1 month apart. had a total of 3 appt in my 1st trimester.