It sounds very promising by your HPTs. When I was pg with DS2 I got a BFP at home, but the drs test didn't show anything and he put the test away and said he'd send me for a blood test instead. Well just as I was walking out I checked the test again and a faint line had appeared, it just took a bit longer than a home test. He didn't bother with the blood test after that and I went on to have a happy healthy bub.

Wishing you luck