If she tested too early then the pregnancy hormones were not high enough to give a positive result.

False positives don't exist because pregnancy tests react to pregnancy hormones. On the other hand a false negative can be possible if the test is done too early and the hormones not high enough.

As a woman who has had many negative home test results while actually pregnant, and using the dates recommended on the box. I consulted with a doctor,apparently false negatives are very common while false positives are very, very rare.

I'd say time for a third test.. or a doctors visit

While I do agree that starting a family is a big step and you should take time to make it. I disagree that there first should be a marriage, before you can start on children. Commitment and support from both partners is of course very important, as is communication and planning about this decisions, but in my eyes that can be obtained in different ways than just marriage. so for the OP I would go talk with your boyfriend again. He might also have been relieved with the negative earlier because he is scared and doubting himself. Talking about having a child and wanting a child is very different from actually having a child and facing that reality.

I upvoted for the “give the boyfriend a chance to react” part but like the other commenter I don’t believe marriage and commitment need to go hand in hand. Marriage isn’t necessary to be fully committed nor does it indicate full commitment.

I'm pretty sure waiting until you see the kid is a bad way to gauge whether you want kids or not... it's a bit late with no return policy at that point.