Advice

I went from having a cycle April26-may-2nd taking a doctors test not pregnant waited later that week took another test pregnant I started bleeding june4-10 hcg levels still going up I did ultrasound while bleeding they didn't see anything now my hcg 500 im still pregnant lines darker I'm convince that im earlier then the doctor said at 1st they was saying I was 4weeks which will now make me 8weeks I went to midwife instead who believe I'm earlier then what those other doctors saying I should b like 4 weeks now.She wants to do a ultrasound today