Mine feels like I need to take a big poo and so much pressure that goes up my back. They're not close enough yet though

Like pressure? Yes it can. With my last that's how I knew I was in labor. My contractions weren't so bad it was the pressure I felt that hurt like hell

I was also wondering because the first time it happened I did use the bathroom but it hurt really bad... guess it's time to start timing then!

yes you will feel the need to use the bathroom really bad the need to push

sounds like contractions, yep