Yes, Jeff, I think maybe she's talking about getting a house in town and envisions Ennis working in town, say at the power company. He hates working on the highway crew, and wants to get another job at a ranch, which would require them to move. So, apparently they compromise, staying at the rental apartment instead of leasing a house.
Okay, I was single at that time in the story, and, yup, you could get birth control pills at the clinic for a nominal fee, say $5 a month.