Depression!!

Is it normal to not feel excited yet about being a mum to be this will be my 1st it is all I ever wanted then I stopped wanting a baby because I tryed for 5 years and yes I was young as I am only 22 now and due in feb still not bought my lb a thing yet just can bring my self to do it I don't no why but when I see little babys I am so in love but I don't feel anything ....