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1Tomkat
This book is an older read. Not by Peter Beagle. Boy finds unicorn. They are in grocery store fighting against a flood. Finds a girl, they both keep unicorn alive then it has a baby.
2MissSquish
Unicorns in the Rain by Barbara Cohen is a faint possibility.
3MyriadBooks
Ariel by Steven Boyett (1983) features a boy and an injured unicorn in a post-apocalyptic city. No idea if it matches your details, though.