I always wanted more than one as I'm an only child and didn't enjoy it.
DH is one of 3, he always wanted 3.
Had 6 mc's then DD1. Loved my time with her so decided to try and have another, had 4 mc's then DD2.
I felt very happy, slightly wistful about not having another, but felt after so many mc's, with two beautiful, healthy, happy, blue eyed, blonde haired daughters that life was pretty perfect and I felt very grateful.
A few years later I had an extremely vivid dream - came home one day to a brown eyed, brown haired teenage boy smiling and saying 'hello mum' as I walked through the door.
I'm not 'woo woo' EVER, don't believe in ghosts, spirits, signs of things, I'm not even nominally religious at all. Straight up practical science bod. I poopoo everything slightly coincidental.
Chatted to DH about possibly trying for another, he agreed. Only a month later I fell pregnant with my now 7 year old DS. And yes, he has hair and eyes the colour of chestnuts.
They day I found out (while i was at home and she was at school), DD1 told everyone in her class at school she was having a brother with brown curly hair. Her teacher took me aside and asked if I had some good news to share. I was so astounded I told her the truth, that I had taken a test while DD was at school! She wasn't at all surprised, she said it happens a lot with siblings. And yes, his hair is also incredibly curly.
Can't explain any of it.