I agree with the above. Everyone does heal differently. My husband's energy level was super low too and probably at 6 weeks he was doing better. However we were able to take slow walks around the block 3 weeks afterwards evn though it tired him out.
Pelvic pain I would definitely call the Dr.
(My husband had bad back pain and a very weak back but he was not walking, sitting or laying properly while healing and threw it out of whack. We went to a chiropractor who used some kind of "thumping" machine on him as I did not want any kind of spinal manipulation and he felt better instantly. 3 visits and it was taken care of. Just some FYI if anybody else has a back situation after surgery who normally does not have back trouble.)