could I be pregnant ??

Debbie
My last period was 6th sept the one previous was 10th Aug and then 16th July, my AF has still not arrived but for the last week my nipples have been so sore & burning I have gas, cramping and weird like butterfly's in my belly been so tired lately Aswel could just fall asleep sat up not like me at all !!!! HELP 4 BFN's upto now :(