I havent been sexually active since the very end of October and i had what i thought was a period right on time in November (it was a bit light but i dont think anything extreme or to unusual). My period this month is 5 days late now and im just not feeling myself. Iv had period like Cramping, head aches, and tender/ itchy breasts for the past few days but no period. This is very unusual for me to not be on time! But i dont think its possible for me to be pregnant if i had a period last month right? Could it be stress instead?