SR20 oil filter fell off when driving HELP!!!

[importknight]

Hi guys i have a 97 240 sr20det, bought it like that a month ago, just drove to the gas station last night like 2-3 blocks away from my school, then wen on my way back to school right before i pulled in my car shut completely off and the all the lights came on. I tried starting it twice and it cranked for 2 secs and i let it off. then just left it, it was bitter cold out last night so i waited till today to check, and to find the oil filter just fell off the motor!!!! with a big puddle of oil under it. ive only had the car for a month or so and have yet to change the oil myself. I put the filter back on and havn't tried to start it again cause it def needs oil, the dip stick had alittle still on the bottom of it. I just checked the oil yesterday before i drove all the way to school and it was fine.

im not sure if i blew the motor or if should put oil in it and try starting it so im asking u guys first..... any help will be appreciated.