Body "feels" pregnant but my head doesn't

So I'm CD20, 5DPO... I've started having dull cramps/aches. Feeling almost period like without the bad pain. Moody beyond belief. Headaches have seen nonstop since yesterday. Slight lower back ache. I know it's early and could be anything but it's farrrr from normal for me- as in... This all only happened when I was pregnant before (resulted in mc). I know I'm prolly making it all up butttt it's just so odd. I'm venting/looking for advice. After so many negative tests my head refuses to believe I'll ever see a positive But the TWW makes it hard to ignore the potential signs...