TTC baby#2 something feels off

You'd think since I already have one I'd know what I feel but apparently not. My SO and I are trying for baby number 2 we want 4 and he's military so we're in a rush. Anyways I'm not due for aunt flow for 8 days but I've been crampy for 2 days but they aren't like my period cramps they are in just one spot really low. And I'm tender. Could this be a sign? Or am I just getting my hopes up?