Breakthrough bleeding? Spotting?

I’ve been taking birth control since April and I decided to skip my period at the end of June because of a vacation. So I started the active pills from the next pack, instead of the inactive pills. It delayed my period by about a week. However for about 9 days had light spotting. It stopped for about a day and then yesterday it felt like I got my “period”. So it seems like I’ve bleeding for a while, is that normal with birth control and/or when skipping periods. How long can I expect this to last? Could it still be my body adjusting to bc? Also I dont ever miss a dose or take it late.