My bub was due to be a pisces, but came 2 weeks early and is instead an Aquarius- same as DH.
I wouldn't worry so much about it- even if you do try to plan it- things don't always go as planned- the universe doesn't work like that!!
Besides, even if your baby is born in a starsign you are not so familiar with, they are their own person, with a unique little soul, and they are likely to be different to others you have met with the same star sign.
It's fine to plan- but I believe it's always good to leave a little bit of your heart open to chance- the universe may just surprise you!!
Besides, I think also sometimes we are given children with personalities far different to our own for a reason- and we learn from them as much as they learn from us. It helps us to grow as people, and it opens up new challenges or 'cosmic tests' if you like.

Best of luck trying to conceive.
Sending you healthy pregnancy vibes........