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Update on baby

So they did my ultrasound this day and im 6 weeks and 5 days i was starting to worry doctors tecqnology said 8 weeks but baby size is 6 weeks and 5 days i have a question at how many weeks can u detect if theres twins in one sac? Last week i went i only had gest sac and now this week my baby was there wth heart beat 123.