Maybe im pregnant??????

ok so for a few days i had these bad backache (which i never had before) i had unprotected a lot the whole week that i was ovulating (fiance & i are ttc) i felt super tired and dont feel like eating much im kina queasy i didnt have any spotting or anything.ive been feeling like this for the past week and last night i had a very mild headache and today i have a stomach ache and my back still hurts. my period is due today and i still havent gotten it im waiting to see if it pops up but nothing yet. This morning i though AF came because i had cramping just like i usually do before my period but this time it wasnt my period just discharge. Anyways my question is if my backache and everything that ive been feeling is a sign of early pregnancy.............if so, has anyone experienced this??? thx =)