Am i pregnant? unprotected .?

my last period started on the 8th of november and ended on the 11th. i had unprotected on the 11th 12th 13th 15th 17th and 27th. i was meant to have my next period on tuesday (the 9th) but i had it in the 11th. but it seems slightly lighter i normally have really heavy periods. it has lasted the same length as my period normally lasts for. i am still geting period pains but i normally get them really bad but there not half as painfull. some people say it could be spotting but i thought spotting meant only a little bit of blood not lasting for days. but i also have weird achy pains like mild shooting pains in my stomach and cramps in my back. and for the last two days i have lost my appetite? could i be pregnant or is there something else wrong?