What's going on!?!

tmi but I am supposed to be on my period. I had small light pink on a pad and that was it. Then this morning there was a little bit of brown on the pad and when I wiped there was brown. The first 2 days of my period are very heavy but there is nothing. My boobs hurt so bad and I barley have any cramps. I am so tired to. My boyfriend and I aren't exactly trying but whatever happens happens. I'm not on birth control and we use condoms. Could I be pregnant? What's going on????