Speculation was the order of the day after it was revealed that the panda flown in from China last year had higher than usual hormones.
The only female of the notoriously barren species in Britain was placed under "24-hour surveillance" to monitor any signs of behavioural changes that could indicate pregnancy.
An expert from China has been flown in to keep an eye out too.
Zoo officials conceded that they actually didn't know whether or not artificially inseminated Tian Tian was expecting.
But that hasn't stopped a chimpanzee's tea party of public speculation over the matter.