Contraction or BH???

Ashley-Marie
Hey everyone! So I'm 39 weeks today and my stomach keeps getting really hard for a minute then softens then gets hard again over and over. It's not painful (feels more like an absolute workout) but it's been happening for a bit. My water is still in tact but I do feel nauseated and slightly hard to breathe but I can't tell if this is a contraction or BH... Can someone please help? :/