The guinea pig in question/in the pictures above is female.
It is possible that your female has not been caught/that one, or both of your guinea pigs are infertile etc… However, the odds are that your female has been caught, and could deliver a litter anytime in the next nine-ish weeks.
Guinea pigs have long gestational periods, and small litters - First time litters tend to be small/single pups are not uncommon.
Please separate your guinea pigs, if you have not done so already; treat your female as if she is pregnant; and familiarise yourself with the forum’s pregnancy guides.