sexing mix up help boys or girls

Heres the situation. The primary school my mum works at has pet guineas, the owners were on holiday over easter, and since i love them we've taken them in for the period. We suspect one might be female and pregnant as it has grown noticably larger (a firm lower abdomen) in even just the 2 weeks...

new pig parent here, we got our pigs ponyo and pancake just under 2 months ago and when we got them we were told they were both female, however a few days ago we went to get them for social time and to our surprise there was a baby piggo in the igloo with pancake, the place we got them from...