B.
I was in a similar situation, but I was able to live with my parents and did not have a boyfriend. I found that the preschools at churches were the least expensive. Most do not accept kids under the age of 3, they have to be potty trained.
My daughter currently goes to Destiny christian center which has part-time preschool for 3+ year olds. But they have Kindergarden all day T, W, Th. My daughter is 5 and was not ready for real kindergarden so I put here there and next year she will start in the public schools. It only costs $190 a month for 3 full days a week.
Otherwise I would try to find a college student, they are usually less expensive. Good Luck