I'm very sorry to hear about your loss and I hope that you are recovering as easily as possible.
A quick Google search sounds like it's normal to get AF anywhere from 5 days to 6 weeks or even longer (depending on your cycle). If you have any questions or concerns about your cycle then I'd really recommend asking your doctor. Even if your question may seem small or "dumb", that's what they're there for! Your body is your body, it isn't our body. So our cycles and our experiences won't always mean that you will have those same cycles or those same experiences.