Am I Wrong For Not Telling My Grandparents To Come to the Birth

When I was with my ex they care to see me once when I once when I was in college they got mad because I spent $40 on something that I really need, so after that they wouldn't call nor not even a text because of that. Secondly when I was in San Antonio they never called nor text but we was on Marco Polo a lot but when I needed help they never did a thing I lived in a car with 2 dogs needed with no food for a whole month I reached out to them but they always say no or we got bills. Then my last month in San Antonio they told me " Come home get your permit and license an we will buy you a car" so I told them ok I'm ready to come home so came home study for my test didn't pass so I decided to talk to someone ( which is my bf) moved out because they always at work so I didn't want them to take off work every week so I went to my bf that always take me to take my test and finally passed only missed one question so I told my grandparents about the big news and he told me Well we not going to give you a car because you not living with us anymore I was pissed off and disappointed because y'all didn't tell me I can be at someone house the person that takes me to doctors appointments, wic appointment, and take me to take my permit test finally passed an y'all not going to get me a car so I said forget it y'all had my hopes and faith all the way up an y'all telling me this so I only said ok I'll ask my dad well he agreed to get me a car but want me go half on it I'm like I don't have that kind of money and my bf doesn't neither because he has his daughter and bills so I told my father don't worry about it an I just left it alone after that. So now I’m 9 months pregnant no phone call nor visits so I just decided not to invite my Grandparents to the most important event of my life but am I wrong