Congratulations on your 4th DC!!!!
I agree with previous posters. IME the fact that a child is a boy or a girl is not important as they all have individual personalities.
My DD loves rough and tumble and has never really liked dolls. My son however, even at 15 months loves playing with dolls something my DD has never done! How does this fit in the stereotype?
If you think your feelings may be a result of your mothers attitude when you were growing up, perhaps it is worth considering your feelings in more detail and how they are exhibited within your family with your children.
You are still getting over the birth of your forth DC, give yourself time. I am sure you have a lot on your plate.
In life there is often an element of wanting what we don't have (people with straight hair want it curly, blondes want it brunette). I have met people with 3 girls, wanting a boy and three boys wanting a girl. Sometimes so much so they overlook what they have! Whatever you are feeling is OK. I am not able to advise you on what you should do that is up to you. However, I would be cautious that your preferences don't go on and influence your children in the way that you feel your mothers influences yours.
I am not sure if that helps and it is just my opinion for what it is worth.
Good luck.