Nothing seen at ultrasound

Ive taken a home pregnancy test basically everyday since june 7th when i had my first faint positive. I do have irregular periods but i was pretty sure i know when i concieved which my lmp was may 7th. I think i ovulated between 23-25 because i track my cervical fluid with my app and my drs office hasn't been able to see a yolk or sac anything. Ive tried to go twice to get my blood drawn to see my hcg levels but after 4 different people poking me in 5 different spots i have yet to go back. Im scared of needles and the stress of them digging and not hitting my vain is to much. I was dripping sweat and so upset after the last try. Should i get another dr offices opinion? Is it just so soon that nothing can even be seen at all and dr should have had me wait?! Please any advice or past experiences would be gladly accepted