Haven't Had Sex in 5 Months

I haven't had sex in 5 months, I've had normal periods each month. Last month for the first time I received my period a bit earlier then normal.. It lasted 5 days like it always does.This month I was due for a period on the 8th & today is now the 11th and I am still without a period. I have always received my period on time and I have never missed. Could I be pregnant?