So I was laying down on my left side and all of a sudden I start feeling like I felt before…

So I was laying down on my left side and all of a sudden I start feeling like I felt before pregnancy when I was about to start my period with cramps and all. It doesn't hurt bad yet but it's definitely uncomfortable. Tried to go to the bathroom to see if it was gas or I needed to have a bowel movement and it wasn't either of those. I'm a FTM so I'm not sure if I'm having Braxton hicks or what. The mild cramping went from my lower stomach now moving upward and now a mix between mild cramps and tightening...