UPDATE: urine preg negative at first OBGYN appointment?

Sophia
Sooo I had my first OB/GYN appointment today, and my urine preg there was negative! They drew blood so I'll know HCG levels tomorrow. I would only be 3 wks 3 days along, and am not sure on DPO. I'm two days late on AF for the first time in my life. Nervous, but feel like I'm probably just too early for them to detect on urine test...I ended up having 4 positive home tests and the lines were progressively getting darker. 😣 
anyone have the same experience?
Most recent home test two days ago: day of expected AF
Update!! 
Blood work came back with HCG at 139! Right on track for 3-4 weeks along 😊 thanks for all the input and support!