I’ve had the same, through to almost 7 weeks now. My OB said it’s normal if there’s no bleeding and it’s not specific to one side; it’s just uterus and ligaments stretching. If you are having either of the above, though, or spotting, definitely call your ob office and they’ll get you sorted.
I swore I was about to start AF with the amt of cramping I had at 5 weeks. Didn’t even test yet, because I was so sure. x