"Oh, god, I completely forgot. You never had these things back in your decade, huh?" Abi laughed as she realised how dumb she'd been, assuming he'd known exactly what they were. "You uh... pee on one end and if you're pregnant, it'll detect a certain protein and come back positive. If not, then negative." She hoped that explained it.
Abi leant into his side, "90 seconds," she said, looking at her bedside clock.