I'm conflicted

I'm 5 weeks just found out two days ago I told my family and they are happy yet worried about my finances. I understand however 
My boyfriend has a 5 year old son with another girl I love the kid yet. His family doesn't seem happy and I feel like they are not interested in my pregnancy like they were hers :/ is this normal for me to feel this I asked my beyfriend not to compare this pregnancy with his first and he understood there are some helpful  pints he gives me from the first one which I respect.   
But will they become interested in my pregnancy?   
Should I tell my bad  how I feel I told him I feel alone because no one seems to be thrilled. About my pregnancy