I was just wondering why I'm not getting my e-mail notifications until about 2 days or more later. Any specific reason why they are so delayed?

Hm. I don't have reports of issues with that, so there may have been an issue with email between here and there.

Do I need to make an report? I noticied today I got a few from Saturday, but not all of them. Does it normally take 2 or 3 days for the notifications to be sent?

Not normally. One other person contacted me that they were having issues, a couple of weeks ago. If you're using the same email provider that shows in your profile, it may well be them....they're often problematic for our automated emails.