Which is more accurate lmp or ultrasound?

Hi I am a little confused on my due date. My last period was 1/29. My lmp is saying my due date is Nov 5 and I have had 5 ultrasounds that all say different dates. Based on vaginal ultrasound at 6 wks my due date is Nov 4th. Based on regular ultrasound at 6 wks my due date is Nov 2 or 3! Based on ultrasound at 10 wks my due date is Nov 1 and based on ultrasound at 16 wks my due date is Nov 2 and based on ultrasound at 20 wks my due date is Nov 3. I'm now so confused that it's stressful. My husband is going crazy because he is in the military and was only home Feb 9th and 20th so conception had to take place one of these days. Someone please help! thanks