I'm 5 weeks as well due Aug 30th with second baby my baby girl is only 8 months! ! Crazy!
Yes it's the night peeing times that are so tiring.....
Felt the same on my 5th/ 6th week! I am 9 weeks now and the cramping is not as bad as before. The only thing I find annoying is I have to get up multiple times during the night/ early in the morning to urinate.. So I don't feel well rested most of the time.
I am 5 weeks as well! Due September 3r this is my second. I am experiencing extreme breast tenderness, frequent urination fatigue and heartburn. Good luck to you and happy delivery!!! :-)