How soon can you re test?

Sian • Mother of 2 boys 💙🌈💙 Second rainbow baby due July 23 🌈🤍

Me and my partner just tested and got a faint positive result. Then re tested with a digital about an hour later and got a not pregnant result. I did drink a lot of water prior to re testing and I am a day early. I know it’s impatient but we was excited but didn’t want to get over excited incase it wasn’t positive but now we’re a bit deflated. We’re going to retest in the morning but does anyone know how long you should actually wait?