It's not fair. I'm the one due in 3 months but my mom expects me to pay all the bills and prepare…

It's not fair. I'm the one due in 3 months but my mom expects me to pay all the bills and prepare for a baby on my own. She will wait until the shut-off date which is right around when I get paid. Then blow her paychecks because the bills are paid. Why not just pay something on them to get ahead? I pay the car note we both use, I have to renew my tags, provide for myself and my son, my cellphone, gas for us both, shop for the baby and my birthday is next month. I get paid once a month. Not fair😔