Luteal phase issue????

proud

So was looking over my BBT charts and noted my LP is not the same each month, it is from 11-14 days with average most months of 13. I was wondering if this is a problem or not??? My cycle is average of 30 days give or take a day and ovulation is average of day 16 give or take a day. Is my cycle considered regular with a day or two change from month to month?