am I in the wrong for being upset?

Sav
* warning: long! *
I'm 20 weeks pregnant with my first baby and I'm having problems with the father. Let me start off with giving some background. he's 21 and has a full time job getting paid 15 dollars an hour. I'm 17 with a part time job making only minimum wage. I can only afford to make my car payment and insurance for the month with both my paychecks. He also has a car payment and a bike payment (which he won't sell but doesn't use) but has good money left over. He used to have his own place but decided to move out to save 500 dollars a month to help pay for the baby. He now lives with me and my family. I asked him last night to pay one doctor bill (an OB bill) because I can't pay it and it needs to pay. He then told me no because he thinks it's stupid that we go to the doctors monthly for this baby. I told him I will continue to go to the doctors because I want the best care for my daughter. Then he said " well if you wanna go to the doctor you can pay the doctor bills." Following with "I'm not even sure if this is my baby". Let me just say that I have been 100% loyal our whole relationship and have never given him a reason not to trust me. After he said that we got into a bigger fight and he started dissing my mother, who used to be his boss and has known for 4 years. (Some background info, my mom is on a leave due to some health issues she's having and only makes a percentage of her check) he said that my parents should stop being shitty parents and pay my car bill and insurance when they can barely afford it. And that my mom should buck up and go to work. He then told me that I was after him for his money and that I shouldn't be asking him to pay bills for the baby. Am I in the wrong for being upset and asking him to pay bills?