What does implantation cramping feel like?

Des

So I've been TTC for over a year now after a miscarriage and the last few days I've been experiencing some cramping? My periods aren't "normal" but they're every 4 months exactly. I've never had cramping before and I'm not expecting AF for another 25 days but I'm really bloated and sometimes even to the point I get naseous. Could this possibly be implantation cramping? HELP. I need advice.