I think places that say 22 aren't counting the 2 weeks between your last menstral cycle and conception, they are only counting the age of the baby. Accounting for that it would still be 24 weeks. Timing measurements aren't always standardized unfortunately. I wish v-day was 22 weeks, it would have made the premature labor I started to have at 23 weeks a little less scary! (luckily it was stopped)