Anybody's AF due the first week in dec?

Becky
Im not very regular but Glow says AF due Dec 4th. But I tested positive on OPKs the 18th 19th and 20th. So according to my OPKs I'm on 8dpo, but glow says I'm 6dpo. This is confusing! Crossing fingers! Anybody due the first week of dec and tested yet?