Early ultrasound ... twins?

So, today i got an ultrasound . The dr. found two sacs . She said we would know for sure in 2 weeks .... Could it be twins? Is it normal just to have the sacs ?? I’m about 6 weeks 1 day but I will know for sure tomorrow once I get my HCG test back.

I had two miscarriages last year . A little worried right now. Dr. said everything was fine , but I still worry.