Venting! Long read!

I need to vent this out to hopefully make myself feel better. I have 4 kids youngest is 6 months and I just found out yesterday im pregnant! It was not a shock since my husband and I did not prevent it but since im keeping quiet I have no one to express myself to! He said he supports any decision I make weather to keep the baby or not...he is the only income provider for our family we make ends meet and like any family we have sturggles and ups and downs. My 6 month old should have been our last and i was going to make a drs apoitment to get tubes tied. Never happened 😒 stupid on my part. Anyway my mother is dead set on telling me how she feels if we ever had another baby shes against it mean while im 30 years old married and been with my husband 8 years...have my own bills my own 4 bedroom apartment and yet still feel her lashing at me for making my own choices. My mom and I are super close so I vent to her often which I shouldent because she can be blunt about things. When I get frustrated at my hysband I tell her etc etc and she goes on about how hes not doing this or that or should be this or that....as my older brother who lives in Hawaii and who i never see anymore has told me if I have another baby he wont ever speak to me again as in being serious. Idk why or how my choices affect their lives at all but apprently it does 😐 sorry for this long venting read but I needed it because im at a crossroads I want the baby and I dont want the baby is that selfish? I know that me doing it all with these kids will be super super super hard and exhausting as it is now....but part of me loves that and the kids and id love one last baby...but I dont want to deal with my family coming down harsh on me!