It used to be the case that certain relationships were mostly centered around having children. If you couldn't produce children - and in many cases, specifically if you couldn't produce boys - then the relationship was considered to be a waste of time. Indeed, many women throughout history have been blamed for "failing" in this regard, whether or not the issue was on their side, with women from Anne Boleyn to millions of unnamed wives being beaten or even murdered.
Fortunately, nowadays we are more enlightened, and we know two things: One, that any child is a blessing regardless of their gender, and two, that people are allowed to postpone children or only have one or two (or even none!) if that's what is best for their relationship, finances, and personality. However, this hasn't erased pressures on couples that vary depending on whether they have a boy or girl first. For example, men become more pro women's rights if they have a girl first, as suddenly they realize that sexism isn't academic and that the person carrying their legacy forward may be unable to do so because of it. Meanwhile some people insist that girls or boys are harder or easier to raise, for all sorts of reasons.
The upshot of it is, that your child's gender may impact your relationship in surprising ways. Let's see if we can spot the gender by finding out a little about you and your boo!