Sounds like there was no rebar in the foundation. Check with county building superintendant. Code may call for rebar.
Also, 4-5 days is not a very long time. Where I live the foundations cures for a few weeks. The forms are not removed for at least 4-5 days.
The 2 inch bow, while large, is probably safe, especially if the rebar was used. As for future leaks, what you describe may have led to leaks anyway, without the cracks.
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