First heat cycle

Our pup started her first heat cycle on Dec 27 (at exactly 7 months of age) and has been steadily bleeding since then. It's not a large amount and she's still eating and drinking, just has less energy than usual. She's a lot calmer and more snuggly too, which we have enjoyed lol. It's weird to have a family member in diapers again 😂

Does this sound normal? I'm also curious how long the first heat cycle lasted for others? Her spay is scheduled for January 30.