can it be twins?

Lilly • 19 years old. married march 3, 2015💍💑miscarried twins may 8, 2015. 👶🏾👶🏾expecting baby #3 march 2016. 💞👶🏾
so i miscarried twins in may. im now pregnant once again but havent had a doctors appointment yet. im 5 weeks 6 days according to glow and already gained 7 pounds. can it be that i possibly may be pregnant with twins once again?