I Was Told I Had A Miscarriage (Doctor Did A

I was told i had a miscarriage (Doctor did a vaginal ultrasound at 4 weeks and a sac was found... did another at 6 weeks and saw nothing) but i am feeling light headed, gained weight, not sleeping throughout the night or having discomfort during sleep, feeling sweaty and would be 9 weeks now... Is it possible that i did not miscarry? 25 years. 127 pounds. 5'4.