What Causes Brown Discharge And Hot Flashes While Trying To Conceive?

I am 18 trying to conceive and some weird stuff has been going on with me lately, ive been ttc for over a year now, today i think i started my period, not real sure though. The past couple of days i have had this brown discharge stuff, and now im having hot flashes, im always tired, loss of appetite, and really bad headaches. What could be wrong with me..