Braxton Hicks?

Hi guys FTM here! So I’m just a little confused, for the last couple of days especially today my stomach has been getting very tight and hard. It feels like it stays like that for a long time and I don’t even notice when my stomach releases. It doesn’t feel like my lower back is tight when it happens nor does any of it hurt, it’s just uncomfortable. I have never felt a contraction my whole pregnancy. I guess I’m just wondering if these are Braxton Hicks? Or if baby just has no more space in there? I’m 38 weeks and 1 day! Thanks ladies!