hmm, you never check and got opposite sex. Last time i checked but still got opposite sex cause mistaken in verify their sex. haha

You better separate them if you dont wish to breed. Or sell it off then get another same sex. Cause if you wish to keep both of them, u might wan to get a companion for both of them then u will end up 4 GPs. I only got to know the mistake when my GP already pregnant and end up i got 5 GPs now.