Congrats! Sounds like you are PG! My GP has always been happy to go by my +HPTs and has said the the tests he uses are about the same, if not less sensitive, than the ones you get at the shops. It quite common to get +HPTs at home but a -HPT at the GP! I don't think there's any way you could not be PG after getting so many BFPs especially with different brands.

All the best for a H&H PG!