Am I crazy?

So today I should be like 6 weeks and 2 days! My first ultrasound isn't until Feb 11th. My symptoms have lessened a bit and I figure they should get worse. I'm freaking out! I called my doctor and I'm pretty sure the nirse thinks I'm nuts. She said I should only be 4 weeks but idk how she's counting so idk. She said all the can do is another HCG which is fine but I'm so lost and upset. She was nice but she just made me feel crazy made my anxiety worse. Don't doctors count from about first day of last period? Anyone else relate?