Early labor?

Hey ladies, can I get some descriptions on your early labor symptoms? Today seems to have been different than other days. I woke up this morning and felt a lot of pelvic pressure, as if baby was very low. Been feeling like I can pee all the time. I've been feeling achy and crampy low and into my back. Got home a little while ago and felt like I was hit by a bus with tiredness... Could this be early labor? Thanks in advance ladies :)