@janedoe123 I have some fresh experience to share
My pup went into heat at 6 mo in September, a few days before turning 7mo and a less than a week before her scheduled spay. Luck haha. She’s a small breed.
The bleeding was pretty light and she kept herself clean all the time, so we barely used diapers. I got them just in case, and put them on her only when she wanted to get onto the sofa
otherwise I just let it bleed, but there wasn’t really much to clean on the floor.
But I washed her bedding and blanket every day to make sure it’s clean and fresh.
In terms of behavior my pup was really sleepy and tired, she didn’t want to eat during first week.
We live in an apartment, so walks were necessary regardless the heat. She wasn’t interested in male dogs at all, she was actually kinda scared of them (never happened before). I obviously avoided contacts with any dogs, just in case. I live in a pretty dog-dense area, so it was impossible to avoid them completely while on walks. Males indeed expressed interest in her for her entire 3 week heat (and even 2 weeks after), but thankfully most of them were on leash.
I had only once incident when an off leash dog ran towards my girl (and the owner was talking on he phone and not caring about her pup at all!!!) - and I had to pick up my puppy.
In general, the heat lasted for 3 weeks. After that the vulva swelling started to reduce, but I don’t think it’s fully gone yet.
I would say it was much less stressful than I expected. I read so many horrors, so I was really scared to walk her. But in reality it wasn’t that bad for my puppy.
My pup will be spayed in late November, almost 2 months after the heat finished. The vet said it’s important to wait so that hormones will balance out.
Edited: as for the advice: I would say take it easy on your pup. She may become nervous, or moody, or clingy, or sleepy. Or start to bark, misbehave and throw tantrums. Whatever she does, show love and affection. It’s not her, it’s the hormones