Your purchase of 10,000 MMBtu priced on NYMEX December settlement (your purchase price), with protection above $3.00 bought on Monday 26 October.
Net result by the 5:00 PM price on 30 October. At or below 2.999 the net result is −$5,970.52. Above 2.999 it is +$4,029.48. The recorded price was 2.883, so the net result was −$5,970.52.