Hgc numbers for twins

Danielle

My Hgc numbers Friday at 5w 1day was a little over 6,000 and monday 5w 4 days was 19,500. My doctor thought this was high and could mean multiples. Does anyone know their numbers at 5 weeks? Abdominal Ultrasound showed just one sac right now and he wants me to come back in 10 days