People with babies already or ones who have seen hair on ultrasounds!!!!!

So I was so bald when I was born, like no hair, and so was my husband!!! So we were like so banking on this baby being bald at, well at the ultrasound yesterday the lady says “dang look at all that hair!” I’m like uhhhhhh wut! I guess she could’ve gotten it from somewhere else in our families, but my husband and his sisters are all super bald when they were babies, and me and my little brother and sister were bald. My other little brother had tons of hair and it looked like this pic, but he has a different father than I do! Where is this hair coming from and has anyone experienced anything like this?!