Contraction questions

What did your first conTractions feel like??? And  how apart were they??? Did they hurt??
Im laying on my left side, and ive been timing for the past 45 mins... every 15(est. 30 secs long) mins i feel pressure in my lower back like if i was about to start my period.... but its not intense its just uncomfortable.....dont know if those are contractions & not sure if i should go in to the hospital or just wait around.... i live 35 mins from hospital...
Please any advice or experiences ladies!!!
Ftm here