<s>[INST] G1p0 went in for US at 7-8 weeks gestation for moderate spotting and cramping. US revealed fraternal twins without heart beats. Went for hcg check and levels good. OB said to come back in one week for repeat US. I was wondering if repeat blood work would be a good idea? And is it normal to not find a heart beat on either twin that early? [/INST] Hello,Mostly, heart activity is evident by 7th week of gestation. Here, it might look bigger sized being twins, more over HCG findings are favorable.So, it is advisable to get USG (Ultrasonography) done after 1 more week to confirm heart beats, before taking any decision.Hope I have answered your query. Let me know if I can assist you further.Regards,Dr. Vasudha Jayant Athavale </s>