period fininshed but having pregnancy symptoms!!

hey, i had my period for 6 days like normal. i have painful periods. But i have stopped bleeding now, but it's been 3 days since i stopped bleeding that i am still feeling sick, bad headaches, very tired even have 9 hour sleep and iv even started to nap in the afternoon. hungry some days and not hungry some days, painful backache! dont know what it could be??! I am sexally active and trying for a baby!

please help, soo confused!