I just want to seek help

Hi there everyone. I hope that you find our story to your best. I just want to seek help. My husband wants a boy and I want a girl. I am so much worried now what it is going to be. I am 2 weeks pregnant. Soon we are going to know what it is. Is it ok to believe on these things? Is the scan or Ultrasound results are always true?? How these scans work?? If anyone of you got any experience in this field do let me know please. Should I be worried for this matter or not?? What should I do and What not I am so much confused and I don't understand what to do. Please help me guys. Help me by giving me more information about that. I am so much looking forward from this forum. Help, please.