Has anyone else had this?

I'm 8 weeks PP. I get this stitch like pain in my right side just under my ribs. I first noticed it when I wore E or carried him for long periods.... It would usually fade when I put him down. I went to the gym this morning and it's really sore now.... Constantly sore and sometimes sharp pain. Do you think it's because I'm just not fit? I also have had spotting on and off every few days... Not sure if that's related or normal.