Can you get oral herpes from someone even if there are no sores? and can you spread to genitals if theres no sore?

Possible: Normal fever blisters are type i virus not usually associated with genital herpes which is type ii , possible type ii virus can infect oral cavity

Yes and yes: It is less likely to be transmissable if no open lesions are present, but people do shed herpes simplex virus in the absence of open ulcers, and therefore transmission is conceivable. It is also possible to transmit to genitals with oral sex, but again, far less likely in the absence of open ulcerative disease.