What penalties can I expect from possession of ecstasy and marijuana? (first time offender)?

I was at OCMD for senior week, sure enough the first day i was there i was arrested. Me and some kids were smoking a blunt out behind my house and the cops ran in and busted us, i was taken in and handcuffed for smoking the blunt but had nothing on me. Later while i was in jail i found on my charges were possession of marijuana and MDMA which were in my bag inside the house. The cops never read me any rights, and there were 17 kids in the house at the time (only 3 were arrested) can i do anything here? and if not what can i expect to be facing? there was 1 pill and 4 grams of high grade weed.