Timing questions?

Kels • 23, married to my best hunky friend!
Got my first positive test 3 days ago (whew!) and took a digital test today, saying 1-2 weeks. And my last cycle was Oct. 24-29. Do you count from the first day of your last period, and that's how far along you are? Or do you go more off of ovulation week? 
My fella and I live on a military base and are moving to another but won't be there until mid January, so I won't have a doctor until then. So I thought I'd ask you guys! Thanks y'all! 🙂