Hcg blood draw- not rising fast

Hey - I am 7 weeks pregnant and they have been watching my levels due to repeat miscarriage. I had an ultrasound done around 5.5 weeks and they saw a gestational sac and a yolk sac but no fetal pole.

Anyone else had hcg not double in 48 hours?

Wed jan 9 - blood draw 13,048

Friday jan 11- blood draw 16,672

Monday Jan 14 - 27,061