Unsure how far along

Sh

So I got my BFP yesterday so YAY IM SO FREAKING HAPPY this will be my first :) but according to my app I’m only 3 weeks and 2 days and I’m getting pretty good strong positives and I’ve already had nausea for over a week now which I keep reading everywhere is a sign of twins this early along but I don’t have any blood related twins in my family. And I know when I ovulated because my cycles are extremely regular and I still have 5 days before my missed period so idk I GUESS I JUST AM CONFUSED about how far along I am 🤰🏼🤷🏼‍♀️