13 weeks and dealing with grief

I'm so stressed, I'm 13 weeks tomorrow and 3 days ago my mum told me dad is kicking her out and taking everything (he is mentally unstable and he's cut her off completely, she has no job but was his carer but he has cut her off and she has no income) she is coming to live with DH and I but I am not coping, how could he do this to me, to mum? I'm so emotional - I haven't been to work since I found out and I'm terrified my grief and devastation will affect my pregnancy :(