Help me 😭

So I am 15 weeks pregnant will my soul mates baby and everything has been perfect and we have both been so excited, until he just told his mum that I'm pregnant and now she has brainwashed him and he is trying to make me choose between him and the baby. I'm at a loss I'm in an absolutle state. All because she said we are too young (I'm 21 and he's 22) and she said we will struggle in the future, and now he has given me this ultimatum. If I want to stay with him I have to abort the baby, and if I want to keep it then he isn't going to stick around. I need help ladies