Is it true that i could be pregnant?!?

okey imm'pretty confused. ialways have my period the last wek of every month. i've never missed a period untill now. me and my boyfriend had un protected sex in febuary,then two days later iahd my period. after that im march we've had unprotected sex about 5 times. & in march imissed my period. its the beginning of april & iTHINK imight have started my period. imm'not sure if its a period or early pregnancy bleeding? lately i've been really tired, so basically fatigue. & having cravings for alot, & when imm'hungry icant go around food because it either doesnt sound good or juss gives me a sick feeling thinking about eating. i've had really bad cramps also. imm'defiantly confused on the whole situation. not so much frequent urination,but when ido have to pee, its alot. whenever iget up iget really light headed & or dizzy & either have to sit back down for a minute or juss stand there untill ican see better & can wlk. imm'irritated easly,but the littlest things tend to irritate me. imm'starting to get hot alot. & imm'usually always cold. lower back pain,really bad. inever bloat on a period but iwas bloated the other day. my breast are kinda sensitive,but only if something pushes on them. since ive had this beeding, the first two tampons iused,when ichanged them there was alot of blood. this third one wasnt really bloody @ all? imm'pretty scared about this. ihavent taken a pregnancy tesst yet. but ineed to kno something fast! itold my boyfriend idid start my period,but now imm'not sure if it is a period? answers asap! could ipossibly be pregnant from the time we had unprotected sex in febuary?