Period on time but brownish blood a day after

i'm 19 and i've had sex w/ only one person. we use protection every time. I'm not on the pill and i've never been on it. we us condoms. no condom has ever broken on us. I've been having normal periods but for the last few weeks i've been feeling really weird. i've had a stomach ache nausea, headache's and some heartburn. it's all stomach pain not lower abdominal or anything. i had my period a week later but still having some of the nausea. The period was on time and everything. It was 4 day's long, normal. it was a heavy period though w/ cramping. now that my period is done i figured i'd be fine. but i still feel nauseous. I now have the flu but that's beyond the point. when i went to the bathroom this morning i noticed after wiping that there was a brown reddish blood stuff. it almos looked like it should be old dried up blood. yet it acted like blood and everything. it was coming out of me as brown. i'd never seen any of this b4. i usually have secretion that are clear or whitish. but nothing like this...I'm worried. I don't have any insurance and I don't wanna have to pay any bills to get it checked on. What should I do? any more questions just ask. i'll be happy to answer as long as it'll help me out. thanx