it is a possibillity that you could be but if it came back negitive then u may have tested to early… if still uncertain see you gp….i have had the same symtoms as you, i usualy have my period on the 5th of each month which last for 5 days but last month (june) i had two one on the 5th for 6 days then again on the 26th for 2 days so im confussed as its wasnt normal for me and latley ive been so tired sleeping all the time, feel sick, headaches etc, so i know what ur going through im giving it a few more days to test to be on the safe side….