Have you done another test? I have a friend who had a chemical PG, but it turned out she WAS pregnant still - must have been twins. She was nearly 11 weeks before she realised she was actually still PG.

Also, are you still BFing and if so, has DD been ill recently? SOmetimes they take a lot more milk and you go up a size while adjusting, and you don't notice so much because one generally pays less attention to how much kids are feeding when they're out of babyhood.

And finally, it's definitely possible the brand has changed rather than you!

Bx