Upset stomach - labor ? Is it connected ?

Now this may sound really dumb but it is my first pregnancy so I don't know the proper signs of maybe going into labor, not like I should because I'm 35 weeks along today.

Just that I've noticed for the last 3 days I've had a really upset stomach and keep going to the toilet. Today I had bad cramping with it too.

Does anyone know what that means in general? The only other time I was like this was when I first got pregnant and I rembered thinking its odd how I have an upset stomach, took a pregnancy test a few days later and saw I was pregnant.

But yeah, does this mean anything at 35 weeks along ?