Stressed with some family members

Have someone experience some stress caused by family members during pregnancy? Im 19 weeks now and at 16 weeks i had an alternative ultrasound and we found we were having a boy. Since then they dont stop telling me that could be wrong. They make fun of me if I refer to my baby as a boy and keep telling me that they are not going to believe it until i getmy next   ultrasound. They havent shown any happiness or emotion towards my pregnancy and thats giving me anxiety. Im going to be happy with a girl or a boy no matter what and i want them to support me and my family no matter what too. Im getting to the point where im about to explode if they keep making me feel this way.