How so? Much easier to say "She's pregnant, test positive, you done it" as one of the things that can block pregnancy is that she's already pregnant
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Otherwise you get two silly sub events.
1 - She doesn't love you enough. Which is for the girls who's first sex scene isn't their pregnancy scene. Talk about pacing as some poor girls don't even get a fraction of the character development other girls get. But really is just saying "She needs more hearts" that game breaking?
This was more because Arc didn't want to go back and code old scenes with the possibly as fans will bitch about continuity errors with them being pregnant while not showing signs of pregnancy. A full plump belly in one scene and skinny in another because there wasn't a pregnant alternative scene available.
2 - You can't meet Nexus Space Nanny yet is the condition that you "Need to progress with the main story more". This is an odd thing were the player doesn't need to have access to the Daycare because one couldn't be available by default somehow. Really don't know why it's convoluted like this. The Mysterious Merchant and Space Nanny would have been combined then you would have had the Daycare out in the wild. Eh that just goes down the "what if" rabbit hole. It is what it is.
While not realistic it's a problem with game design. Arc uses Koikatsu to make the characters but the game doesn't include the Koikatsu 3D Engine so the characters can't be changed on the fly as everything is Pre-Rendered. He could go through and redo old scenes with new models and has done it before rather easily but given the scope of the project it scales horribly. On the flipside he could have held off on the baby part until Act 3 which would have given the player 9 months gestation with like a time skip transition but it would have been more of an interlude. A bit late now as you get 1 week, even less with Pixie because of course the star of the show would get rushed to 1 day
Breaking down the "WHY" the event is locked would be more informative then "It's locked, shake the magic 8 ball and ask why" it could be any or all of the above.