Elevated BBT for 11 days?

i have been recording my BBT for 3 months now and my nrmal temp is at 96.4. i go up to around 97.5 during ovulation i think and menstration. but this monthit went up to98.6 and hasnt gone below 97.2 for about 11 days. what does this all mean? am i ovulating this long or am i possibly pregnant or what. im so confused with all of this.