My mom thinks I'm not pregnant

I decided to go to my Dr as I had missed my period but because I'm irregular I didn't think she would say I was pregnant. However I was throwing up everything. I found I was already 2 months along. Now my mom is suspicious because she says my breasts haven't grown or my butt. I told her pregnancy is different for everyone. She says most people have those two mainly. Anyhow I ignored her. Now she wants me to do a blood test to make sure I'm pregnant. I'm starting to think maybe she's right.