im 19.....i had sex while i was ovulating (i think i was). cause i always have a sharp pain in one of my side and this time i didnt felt it..but i had cervical mucus cause it was clear stretchy. and it was august 27-30 i had the mucus...like about 3 to 5 days later i got mucus but it was little bit and it was only once i got it that day...now i expected to have my period 10 or 11 but i started to have brownish mucus spotting for 2 days now and its only in the morning with light cramping which when i have cramping its mild and uncomfortable my back and my legs hurt but it only my pelvic region. could i be pregnant or my period are changing??