I attempted at six weeks PP and I blood after and it was so painful. It felt like I was losing my virginity, but it went away after a few other times.
I’m five months post partum and still bleed, but the pain isn’t there anymore.
First time was 4w+5. Normal with some stretching pain initially. But I know it’s painful for a long time after delivery for some women. It can vary greatly for everyone I think.