Upset with my mother. Am I being rude?

Melissa • I'm 27 and a FTM. My fiancé and I are over the moon about this baby God has given us the chance to raise!! Lil bear.
I allowed my mom, oldest sister (she brought me nephew) and my husband to witness the gender ultra sound. Those rooms are small. I already really didn't want that many people but I'm to nice and let people talk me into crap. The ultrasound tech wasn't very happy with that many people either being its supposed to be a quite Intamit setting. And my family is loud. Now it's almost time for our 4D ultrasound and my own mother called ME rude because I told her I'd rather not have everyone go. Just me and my husband. Being this is our first kid this is all new to us and it's our time we feel. Am I being Rude?