Evicting roommates That aren't on the lease, or filed for occupancy applications.?

The guy I'm living with (we're bf/gf without a title) recently acquired a new roommate "George", and his girlfriend "Jane" (she's been staying the night quite a bit over the last month but just recently starting moving in over the last couple weeks). neither of them are on the lease nor have they filed occupancy applications. George has had trouble finding a job, but Jane has one. neither have been asked to pay rent until George gets a job. but he has been slacking and taking advantage of living rent free. But that's not the concern, they are complete slobs and have been asked repetitively to clean up the dishes they use (which are mine) and even had to go as far as setting a time frame on when it needed to be done (nothing sits out or left in the sink over night is what they've been asked to maintain) That has yet to be honored and I'm the one that ends up doing it all the next day after work. I've told them time and again that I don't like filth or bugs/rodents that are attracted to filthy areas. I'm tired of repeating myself and they just need to go. But it might not be that easy, Jane has just found out she's 5 weeks pregnant. Neither have mail coming to the address that I'm aware of and neither have a set of keys. How do we go about asking them to leave/ move out without creating animosity or a big legal battle? Also what is a fair time frame to give them to leave since only Jane has a job and pregnant?