Please advise

My cousin is 17 nearly and he's not ready ro be a daddy his gf of 2years has told him that she's pregnant but he said he's 100% sure he used a condom everytime but she stayed over in his room at my aunties whilst he went away for a week she was also on the pill but she told him she was still taking it but rold her mum that she stopped taking it a while ago and she just wants to get pregnant she's only just turned 17 and is very immature no patients or anything and my cousin is suffering with very bad depression he also told her he doesn't want a baby and he tokd her she should get rid of the baby and her mum has said she should get rid as she's not mentally stable enough to have a child