Early labor?

Hey everyone.. I've been having irregular contractions for the past 2 days pretty intense though.. Back pains that no matter which way i sit lay stand etc im just uncomfortable. Nausea and headache and been using the bathroom(#2) alot past 2 days.. Do you think this can be the start of early labor?? I drink alot of water and try to rest as much as i can since its been very uncomfortable. This is my 3rd child and this whole pregnancy has been completely different from my other 2 so im just curious..