So confuse😔

Maira • Hi!
Please if anyone has been thru this please comment with your experience I had bleeding yesterday an I'm 10 weeks pregnant went to the ER an had a viginal ultrasound an my baby measures at 6 weeks 4 days? How is that possible? I heard the baby's heart beat❤️ i haven't had a period in 2 months I'm  so confuse?