Early ultrasound 4 weeks

Caitlyn • Mommy to baby boy Oct 2018 💙

I am almost at 5 weeks had my early ultrasound yesterday to see the placement as I had an ectopic in Jan. My doctor called and said we have an intrauterine pregnancy so yay for that. I am going back in 2 weeks to see progress. Just curious how to read the side but which side is the sac on?