I had a BT done at 12DPO. I'd got a very very faint line that morning but wanted it confirmed. My urine test came up negative at the Dr's - i was sure i had imagined the line that morning - but sure enough the results did come back positive. I was just in very early days - only 3-4weeks he reckoned (with HCG level of 58). If you want peace of mind then go in and have a chat - i'm sure they won't object. WIshing you the very best